apps/fsutils/mkfatfs: When fsutils/mkfats was split off from the operating...

apps/fsutils/mkfatfs:  When fsutils/mkfats was split off from the operating system, there were a few dangling things left.  Some references to functions in the OS (which are not available in the protected and kernel modes) and several types and function prototeypes that don't exist is apps/fsutils/mkfatfs.