Clean up top-level build file and build options, fix build issues on MinGW

CMake: greentea: Migrate the NFC EEPROM test to CTest

CMake: connectivity: Add drivers subdirectory for tests ...

Greentea tests run on microcontrollers, so any required drivers need
to be available and built.

Note: Even though unit tests do not require drivers, for ease of
maintenance there's no need to exclude those drivers when building unit
tests because a driver only gets enabled when the Mbed target matches.

CMake: connectivity: Unify checks for unit and greentea tests ...

Subdirectories should always be included in the CMake "all" target when
building any tests, either unit tests or greentea tests.

CMake: Create mbed-headers-ble library ...

Previously ble headers are part of mbed-headers-connectivity, this PR
moves ble headers into new mbed-headers-ble to make ble stubs to be
more self-contained and improves the composition of the library.

CMake: Move nanostack libservice stubs to the connectivity/libraries dir ...

Move the connectivity nanostack-libservice stubs into the connectivity/libraries
directory where the nanostack libservice component present as nanostack
libservice source copied from the external repo. So we can avoid duplicating
the mbed-os source tree in a central UNITTESTS folder.

CMake: Move mbedtls stubs to the mbedtls dir ...

Move the connectivity mbedtls stubs into the connectivity/mbedtls
component directory. So we can avoid duplicating the mbed-os source
tree in a central UNITTESTS folder.

CMake: Move CMAKE_CROSSCOMPILING check inside library CMake

Merge pull request #14486 from jeromecoutant/PR_CLI2_BLE ...

CMake COMPONENT_BlueNRG_MS: fix mbed-ble

[CMAKE] COMPONENT_BlueNRG_MS: fix mbed-ble

Make CryptoCell 310 part of mbed-mbedtls on supported targets ...

The CMake target mbed-mbedtls-cryptocell310 was not linked by
default, resulting in a compilation error on targets that use
Mbed TLS:

    fatal error: mbedtls_device.h: No such file or directory

Other Mbed TLS drivers simply add themselve to mbed-mbedtls, so this
commits does the alignment to fix the build error.

Note: the driver and the core Mbed TLS have mutual dependency, so
they need to be one CMake target.

CMake: Rename CMake targets ...

* mbed-os renamed mbed-core
* mbed-os-<COMPONENT> renamed mbed-<COMPONENT>

CMake: Componentize Mbed OS into multiple CMake targets (#13732) ...

Aside from the core mbed-os CMake target, a number of targets have been created so they can optionally be included by application executables that require them using `target_link_libraries()`.

Co-authored-by: Martin Kojtal <martin.kojtal@arm.com>
Co-authored-by: Rajkumar Kanagaraj <rajkumar.kanagaraj@arm.com>

CMake: Fix build failure due to lora, cryptocell, and nfc dirs move

CMake: Fix failure due to MbedTLS rdir relocation

CMake: Fix breakage due to BLE dir move

CMake: Fix build failure due to nanostack dir move

CMake: Fix build failure due to drivers and lwipstack dirs move

CMake: Fix build due to system_storage and netsocket dir move in master

CMake: Fix failure due to kvstore and cellular dirs changes

CMake: Add support for connectivity dir