Unify the __CORTEX_A macro in the files containing cmsis.h

Remove unused old symbols: __MBED_CMSIS_RTOS_CM/A9

Update Mbed version block

Merge pull request #14801 from paul-szczepanek-arm/fix-ble ...

BKE: fix statements outside correct feature guard blocks

put statements inside the correct feature guard blocks

Merge pull request #14797 from saheerb/mbedtls_fix ...

run example-tls on faster K64F board (than K66F)

Merge pull request #14749 from tymoteuszblochmobica/fcntl ...

Fcntl  setting improvement,

Merge pull request #14747 from paul-szczepanek-arm/fix-adv-con ...

BLE: fix advertising set termination event

run example-tls on faster K64F board (than K66F)

Merge pull request #14752 from tymoteuszblochmobica/sockets ...

LWIP Broadcast  socket option added

Merge pull request #14772 from LDong-Arm/mbedtls_timing ...

Improve implementation of Mbed TLS timing

Move Mbed TLS self tests to a separate configuration ...

We potentially save flash space by not enabling Mbed TLS self-tests
by default. A new test config file, TESTS/configs/mbedtls.json, is
provided to enable self tests. This newly created JSON file also
enables timing in Mbed TLS so timing gets tested.

mbedtls: Run mbedtls_timing_self_test if MBEDTLS_TIMING_C ...

This allows us to verify the support for Mbed TLS timing on Mbed OS.

Note: The macros MBEDTLS_TIMING_C and MBEDTLS_TIMING_ALT are not
enabled by default and need to be additionally enabled to run this
test.

mbedtls: Use LowPowerTimeout for mbedtls_set_alarm() if available ...

The function `mbedtls_set_alarm()` is only precise to seconds, so
`LowPowerTimeout` is enough and saves power.

timing_mbed.cpp: Check MBEDTLS_TIMING_ALT ...

Do not compile the Mbed implementation of Mbed TLS unless
MBEDTLS_TIMING_ALT is defined. This prevents a macro check error on
devices that do not have LPTICKER or USTICKER when Mbed TLS timing
is not enabled.

mbedtls: Add full platform implementation of timing ...

When MBEDTLS_TIMING_C and MBEDTLS_TIMING_ALT are enabled,
the Arm Compiler generates errors like the following (one for
each missing symbol):

    Error: L6218E: Undefined symbol mbedtls_timing_get_delay

Reason:

The function `mbedtls_timing_self_test()` in the Mbed TLS default
`timing.c` always gets compiled, if MBEDTLS_SELF_TEST is defined.
And MBEDTLS_SELF_TEST is always defined, as we have a Greentea test
to run some of the Mbed TLS self tests. (In the future we should try
not to enable MBEDTLS_SELF_TEST except for tests, but it requires
a rework in our test flow.)

`mbedtls_timing_self_test()` tests (calls) the full API declared in
`timing.h`, and the ARM Compiler requires all symbols referenced by
all functions to be defined, even those not used by the final
application. This is unlike GCC_ARM which resolves what are required.

Solution:

To fix the "undefined symbol" errors, we add an implementation of
`mbedtls_timing_get_timer()` based on Mbed OS `LowPowerTimer` or
`Timer` (depending on which one is available), and copy Mbed TLS's
default `mbedtls_timing_set_delay()` and `mbedtls_timing_get_delay()`
which are built on top of `mbedtls_timing_get_timer()`. This will also
benefit user applications that need to enable timing in Mbed TLS.

mbedtls: Use LowPowerTimer/Timer for timing ...

Previously we used `gettimeofday()` for Mbed TLS timing, but its
implementation provided by Mbed OS is only precise to seconds. The
microsecond component of the output `struct timeval` is always set
to zero. But Mbed TLS requires millisecond precision.

To provide required timing precision, switch to use `LowPowerTicker`
or (microsecond) `Ticker`. `LowPowerTicker` is preferred as it saves
power and Mbed TLS does not require microsecond precision.

Merge pull request #14768 from anttiylitokola/update-mbed-coap ...

Update mbed-coap to version v5.1.11

Merge pull request #14767 from ghseb/early-test-skip ...

connectivity tests: early skip fix

Merge pull request #14741 from boraozgen/trng-def-checks ...

MbedTLS: Add definition checks for TRNG

Early test skip ...

Adding mbed-os subdirectories that are not required for a specific project to .mbedignore is a good way to reduce compilation time. Sometimes it happens that tests depend on ignored files, which causes the test-build to fail even though the corresponding feature/component
is not configured. The reason is that the conditional that skips the test is placed after the includes.

Merge pull request #14750 from tymoteuszblochmobica/size_spi ...

Increase SPI stack size to 2048 for BlueNrg driver

Merge pull request #14765 from rwalton-arm/fix_unittest_check ...

Fix unittest check

Update mbed-coap to version v5.1.11 ...

Block-Wise request (block1) error handling improvements:
 * Removed SN_COAP_BLOCKWISE_MAX_TIME_DATA_STORED usage. Block-Wise requests will now follow normal retranmission rules.
 * Process block1 responses only once. If response is coming in wrong order just ignore it wait next response to happen.

Merge pull request #14748 from AlbanJeantheau-silabs/fix_calculate_ufsi ...

Correct ufsi timing calculation

Merge pull request #14743 from OpenNuvoton/nuvoton_m251_m261_wdt ...

Nuvoton: Support watchdog on M251/M261 series

Merge pull request #14734 from jeromecoutant/PR_RFSWITCH ...

STM32WL LORA: HW specific out of STM32WL_LoRaRadio class

Merge pull request #14760 from Patater/tls-timing-alt-fix ...

mbedtls: Rename Mbed timing implementation

Merge pull request #14737 from paul-szczepanek-arm/cmake-ble-rebased ...

BLE: Add cmake unittest fakes for BLE and events

remove unittest readme