DO NOT MERGE New ext4enc kernel switching from xattrs to ioctl

(cherrypicked from commit 5e7f0042318156ef39c1e4641613f3191ea85b4a)

This is one of three changes to enable this functionality:
  https://android-review.googlesource.com/#/c/146259/
  https://android-review.googlesource.com/#/c/146264/
  https://android-review.googlesource.com/#/c/146265/

Bug: 18151196

Change-Id: Iba5146b8be1e15050ae901e08b3aaa26d96dcf7e
1 file changed