Try and fix host tests

Convert storage/ targets into STATIC libraries

Unit tests: Create mbed-headers-filesystem ...

Create a CMake target mbed-headers-filesystem to separate FileSystem
headers from the generic mbed-headers-storage. Update tests to use it.

CMake: Move CMAKE_CROSSCOMPILING check inside library CMake

CMake: Add support for OSPIF blockdevice

CMake fix: location of MBED_CONF_FILESYSTEM_PRESENT=1

KVStore: componentize CMake definitions into sub-components

CMake: Rename CMake targets ...

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

cmake: fix present inclusion ...

We use only _PRESENT macros for components if they are enabled. Use the same in
the mbed.h file or anywhere else.

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 due to system_storage and netsocket dir move in master

CMake: Add support for storage dir