modules/fatfs: Move FATFS Zephyr specific code and cmake

The code moves Zephyr specific code and CMakeLists.txt
under modules/fatfs/.

The commit also adds zephyr_fatfs_config.h header file, that
is now used to override FF_ options of ffconf.h file within
fatfs repository.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
4 files changed