Revert "Drop special handling of app_data_file in mls constraints."

This reverts commit 27042f6d.

Managed profiles are represented by new android users which have the ability to
communicate across profiles as governed by an IntentFilter provisioned by the
DevicePolicyManager.  This communication includes reading and writing content
URIs, which is currently obstructed by the mls separation between an owning user
and its managed profile.

Bug: 19444116
Bug: 19525465
Bug: 19540297
Bug: 19592525
Change-Id: Id9a97f24081902bceab5a96ddffd9276d751775b