CMake: Move CMAKE_CROSSCOMPILING check inside library CMake

CMake: add mbed_ prefix to our CMake files ...

To avoid conflicts as we expose our CMake list files via CMAKE_MODULE_PATH. Some files already include it, this
aligns the rest of files.

I leave app.cmake as it is - it's user facing and it would be breaking change. We can clean this one for the next major version.

CMake targets: remove labels usage, not required anymore

WICED: Move directory to WiFi driver ...

WICED is something is build to Cypress WiFi on multiple devices, it's a binary form. It is owned
by Seeed studio

CMake: Refactor WIO_EMW3166 support ...

Ensure WICED is included for Mbed targets that require it.

This also removes the need for checking MBED_TARGET_LABELS repeatedly and
allows us to be more flexible in the way we include MBED_TARGET
source in the build.

A side effect of this is it will allow us to support custom targets
without breaking the build for 'standard' targets, as we use CMake's
standard mechanism for adding build rules to the build system, rather
than implementing our own layer of logic to exclude files not needed for
the target being built. Using this approach, if an MBED_TARGET is not
linked to using `target_link_libraries` its source files will not be
added to the build. This means custom target source can be added to the
user's application CMakeLists.txt without polluting the build system
when trying to compile for a standard MBED_TARGET.

cmake: Refactor ST targets ...

Refactor all ST targets to be CMake buildsystem targets. This removes
the need for checking MBED_TARGET_LABELS repeatedly and allows us to be
more flexible in the way we include MBED_TARGET source in the build.

A side effect of this is it will allow us to support custom targets
without breaking the build for 'standard' targets, as we use CMake's
standard mechanism for adding build rules to the build system, rather
than implementing our own layer of logic to exclude files not needed for
the target being built. Using this approach, if an MBED_TARGET is not
linked to using `target_link_libraries` its source files will not be
added to the build. This means custom target source can be added to the
user's application CMakeLists.txt without polluting the build system
when trying to compile for a standard MBED_TARGET.

CMake: Add support for Arm's CM3DS_MPS2 target

CMake: add cmake support for Toshiba targets

CMake: Add support Ambiq targets

Merge pull request #14027 from hugueskamba/hk_cmake_fix_analog_devices_support ...

CMake: Fix Analog Devices targets support

CMake: Port Renesas targets to CMake ...

Add targets subdirectory to high level CMake configuration file and
create new configurations for MCUs and individual targets. Change the
interpreter in the ARM scatter file to armclang, which is required for
CMake. Remove private and public interfaces in emac target
configuration. Ensure that all targets build on the arm gcc compiler and
arm compiler.

CMake: Fix Analog Devices targets support ...

* Fix CMake syntax errors
* Fix indentation
* List directories and source files in alpahabetical order with spaces between files located in different directories
* Create STARTUP_FILE variable as done for all other targets

CMake: fix targets missing )

Merge branch 'port_analog_devices' of https://github.com/harmut01/mbed-os into dev_cmake_targets

Merge branch 'hk_cmake_add_samsung' of https://github.com/hugueskamba/mbed-os into dev_cmake_targets

Merge branch 'hk_cmake_wiced_suppport' of https://github.com/hugueskamba/mbed-os into hugueskamba-hk_cmake_wiced_suppport

Add CMake support for all Renesas targets ...

Add configuration files for targets and individual MCUs. Add include
paths and sources to mbed-core link library and specify linker and
startup scripts.

CMake: Add support for LPC11XX_11CXX targets ...

All LPC11XX_11CXX targets supported by Mbed OS
can now be built with CMake.

CMake: Add support for Samsung SIDK_S1SBP6A target

CMake: Add support for SiLabs EFM32GG targets

CMake: Add support for GigaDevice targets ...

Add CMakeLists.txt files to list all the target sources and include directories

Merge pull request #13970 from hugueskamba/hk_cmake_add_maxim_support ...

CMake: Add support for all Maxim Mbed targets

CMake: Add support for CY8CKIT064B0S2_4343W

CMake: Add support for Maxim MAX32620C targets ...

Add CMakeLists.txt file to for the target family source files.

CMake: Add support for WICED target ...

* Add CMakeLists.txt file
* Update the list of supported target

Merge pull request #13922 from 0xc0170/cmake-nuvoton ...

CMake: add nuvoton targets

CMake: Add support for all ARM's FM Mbed targets ...

Add CMakeLists.txt files so all ARM's FM Mbed targets can be built with CMake

CMake: add nuvoton targets

CMake: replace usage of the mbed_add_cmake_directory_if_labels() function (#13754) ...

Directories that start with special prefixes (TARGET_, FEATURE_, COMPONENT_)  are added to the build based on Mbed target configuration from targets.json instead of calling utility function mbed_add_cmake_directory_if_labels().

CMake: Fix failure due to events and netsocket dirs changes