[1/2]smdk4412: exFAT Support

smdk4412-common: https://gerrit.omnirom.org/#/c/3132/

Change-Id: I211e0b47db8ce3b134fe1d6a0d9237a322fa6f9b
smdk4412: exFAT 1.2.5 (Samsung OSRC)

Change-Id: I299a53095a4777f457cd2e70edde74d8766256cc
Make exfat built-in