ext4: Add no_sehash_xattr mount option

* Useful for devices where /persist may have unexpected SELinux
  contexts but xattr of root directory is valid, leading to
  restorecon early exitting without traversing the partition.

Issue: FP2A10-150
Change-Id: I5089ff90f76aa9f3db7da26f73548cf62fe67bd0
3 files changed