Implement the low-level FatFS commands in MOS (Stage 2)

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Implement the following methods:

• ffs_api_ftruncate
• ffs_api_fsync
• ffs_api_fforward
• ffs_api_fexpand
• ffs_api_fgets
• ffs_api_fputc
• ffs_api_fputs
• ffs_api_fprintf
• ffs_api_ftell
• ffs_api_fsize
• ffs_api_ferror
• ffs_api_dopen
• ffs_api_dclose
• ffs_api_dread
• ffs_api_dfindfirst
• ffs_api_dfindnext
• ffs_api_unlink
• ffs_api_rename
• ffs_api_chmod
• ffs_api_utime
• ffs_api_mkdir
• ffs_api_chdir
• ffs_api_chdrive
• ffs_api_getcwd
• ffs_api_mount
• ffs_api_mkfs
• ffs_api_fdisk
• ffs_api_getfree
• ffs_api_getlabel
• ffs_api_setlabel
• ffs_api_setcp