fs/exfat: Squahed commits for exfat support

drivers/exfat: add Samsung's open source exFat module version 1.2.4
drivers/Makefile: add exFat support
exfat: AIO Optimization compatibility fixup
exfat: sync'ed to latest driver from https://github.com/dorimanx/exfat-nofuse
moved under fs/ to be the same as other fs drivers
exfat: hacked name for HTC's hardcoded vold
exfat: more HTC vold mount option hacks!
exfat: change printk to debug printk to reduce dmesg spam/flood
exfat: fix derpy #defines
exfat: more #define fix ups.
remove "feature flags" because they have already been moved to Kconfig.
this will eliminate flag clashing
exfat: clean up old remanent