Revert "Added exFAT kconfig and build it as module"

This reverts commit 324d1d4f5fc240fd3bc80ff1292474c12cdc8e94.
Revert "drivers/Makefile: fix exfat driver path"

This reverts commit 6cee9c0ac0882d052c3f0f75d56d9c2016f14215.
Revert "drivers/exfat: add Samsung's open source exFat module version 1.2.4"

This reverts commit b220033c9c63a613578639244b8caa4f9438be91.
Added Samsung's exfat source, modded by @rxrz @lqs and @dorimanx

for more details, visit:

http://opensource.samsung.com/reception/receptionSub.do?method=sub&sub=F&searchValue=exfat

and

https://github.com/dorimanx/exfat-nofuse
exfat config dump
exfat_super: fix compatibility issue