DO NOT MERGE Use default key permissions for ext4enc

(cherry-picked from commit 1190a26f6d7dd34bf10ffc7b367b374d5e591146)

As per discussion default permissions are the correct ones.
Note that since we use logon keys, they cannot be read outside
the kernel.

Note also that we limit who can read/write keys in selinux policy.

Bug: 18151196
Change-Id: Icc916f430a70eff22e6b74c20ec361c8f3789c1c
1 file changed