[2/4] exFAT Support

FUSE based exFAT Implementation

(1/4) manifest: https://gerrit.slimroms.net/6927
(2/4) vendor: https://gerrit.slimroms.net/5445
(3/4) sepolicy (vendor): https://gerrit.slimroms.net/7161
(4/4) vold: https://gerrit.slimroms.net/6983

Change-Id: Icea799a60e888acb161c837aad93d9331ded66c5