Merge pull request #15067 from ARMmbed/fix_flash_overflow_callback_big_test ...

Greentea: Fix flash overflown issue in callback_big test

Greentea: Fix flash overflown issue in callback_big test ...

The "Callback_big" greentea test has six test cases that require
a minimum above 36kb ROM to build all test cases. LPC1114 target
has only 32KB ROM memory, so the limit 6th test case to include
or exclude based on the target minimum ROM size.

Note:
In LPC1114 target, callback_big test has ROM overflow build issue
for both Mbed CLI1 and CLI2.

CMake: Fix platform wait_ns greentea test Cmake ...

Mbed CLI 2 generates TARGET_ARM_FM macro as a string in mbed_config.cmake
under the MBED_TARGET_DEFINITIONS list. Fix the "if defined" check for
TARGET_ARM_FM by searching for the TARGET_ARM_FM string in the
MBED_TARGET_DEFINITIONS list. This allows us to skip or include the test from CMake.

Update platform CMake to include greentea test dir

CMake: greentea: Add skip reason to platform test

CMake: Refactor platform greentea test CMake ...

Initially, every library greentea test has its project() creation in
their CMake. As running greentea using CTest move all greentea test
suite under one global project mbed-os and MBED_CONFIG_PATH set at
the root mbed os CMake under the condition BUILD_GREENTEA_TESTS
check so refactored platform greentea CMake accordingly.

Merge pull request #14718 from Meano/develop ...

Feature: Make changes for Cortex-A5 support

CMake: Require TEST_SOURCES in greentea CMake file ...

Assumption that greentea test file is always named main.cpp is
incorrect. Updated mbed_greentea_add_test() macro to make TEST_SOURCES
parameter compulsory, which is used to specify greentea test
file(s). This allows tests to use C, or have a different name.
Therefore also updated all pre-existing greentea test CMake files to
explicity add main.cpp to TEST_SOURCES.

Make changes for Cortex-A5 support

[STD-PIN] BUTTON and LED define ...

hal/tests/TESTS/mbed_hal/gpio/main.cpp is replaced by
hal/tests/TESTS/pin_names/generic/main.cpp now

Fix CMake include path for the minimal-printf test

CMake: rename greentea test macro

CMake: Add platform greentea test with CMake

Merge pull request #13548 from evva-sfw/enhance-minimal-printf ...

Add width modifier and prepending zeros for hexadecimal output and decimal precision for floating point

Add width modifier and prepending zeros for integer, hexadecimal and floating point output as well as decimal precision for floating point

Change MBED_STATIC_ASSERTs version for built-in

Move greentea test closure to library

Move mbed_functional tests into platform/tests/TESTS

Adding required host_tests

Refactoring \platform as per directory structure proposal. ...

Mbed OS will soon be changing directory structure to the below:

```
[component name]
├── mbed_lib.json
├── CMakeList.txt
├── README.md
├── include
│   └── [component name]
│       └── internal
├── source
└── tests
    ├── <framework>
    │   └── <test suite one>
    ├── UNITTESTS
    │   └── <unit test suite one>
    └── TESTS
        └── <greentea test suite one>
```
This PR implements the above new directory structure for the current \platform directory.
**NOTE:** This PR does NOT include the refactoring of UNITTESTS as shown in the above directory structure. This will be done in a subsequent PR.