f2fs: update to latest version 3.4.y
Revert "exfat: fix derpy #defines"

This reverts commit fe241e9f04ea56949bd25528667a83e8c92039e2.
Revert: 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 (reverted from commit 6fa4a0ddaf6ff9a79d6f5fa4c2fa9bc10983c0da)
fs: exFAT: Update to v1.2.9

 * From KitKat source drop

Change-Id: I7ad46ae9abdb0f2b83a482f81ac7c30b3f32953c