Don't run fsck on certain block devices

Make sure we're not running fsck on block devices where it
doesn't make any sense. In particular, we should not be running
fsck on /system since it's mounted read-only, and any modification
to that block device will screw up verified boot.

Change-Id: Ic8dd4b0519b423bb5ceb814daeebef06a8f065b4
1 file changed