modules: fs: Add reentrant zephyr support

This commit enables zephyr to configure the FatFs FF_FS_REENTRANT
option and support fs actions from multiple threads.
CONFIG_FS_FATFS_REENTRANT enables the option and provides zephyr
mutex wrappers.

Signed-off-by: Nicola Ochsenbein <Nicola.Ochsenbein@husqvarnagroup.com>
4 files changed