fs: exFAT: Update to v1.2.9

 * From KitKat source drop

Change-Id: I7ad46ae9abdb0f2b83a482f81ac7c30b3f32953c

Conflicts:

	fs/exfat/exfat_super.c
	fs/exfat/exfat_version.h

Conflicts:
	fs/exfat/exfat.c
	fs/exfat/exfat_version.h