[automerger skipped] Merge "PhoneInterfaceManager: Simplify WorkSource derivation." am: 081a469002  -s ours am: e5efde646c  -s ours am: 2d2aa6fa28  -s ours
am: 00f257d399  -s ours

Change-Id: I503ba716e8fd828ecc54dc53eae276795b33fc69