blkid: Add support for probing exFAT

 * e2fsprogs can't currently detect exFAT filesystems.
 * Apply patch from GoogleTV to add support.

Change-Id: Ib08bdb1d13e995d133a62539e3bfa0e3a22eeead
e2fsprogs: blkid: Add Flash-Friendly File System (f2fs) support

Backported from mainline util-linux

Change-Id: I3afb543ed027786ee20c3e7c9093ff7f5af54a04