drivers/exfat: add Samsung's open source exFat module version 1.2.4

Signed-off-by: Paul Reioux <reioux@gmail.com>
drivers/Makefile: add exFat support

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	drivers/Makefile
exfat: AIO Optimization compatibility fixup

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: sync'ed to latest driver from https://github.com/dorimanx/exfat-nofuse

thanks to @dorimanx and others who have contributed to exfat development

moved under fs/ to be the same as other fs drivers

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	fs/Kconfig
exfat: hacked name for HTC's hardcoded vold

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: more HTC vold mount option hacks!

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: change printk to debug printk to reduce dmesg spam/flood

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: fix derpy #defines

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: more #define fix ups.

remove "feature flags" because they have already been moved to Kconfig.
this will eliminate flag clashing

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: clean up old remanent

Signed-off-by: Paul Reioux <reioux@gmail.com>