[automerger skipped] Merge "libbinder: avoid re-registering callback" into rvc-dev am: e515579fae am: ed0988a12e am: cf7b8beec7 am: 385b7156b7 -s ours

am skip reason: Change-Id I19474e105b4c4b3669499ac71c8cf22b67a0176b with SHA-1 6077425c5c is in history

Change-Id: Ie8dc5d9f36afc576311187ec6f250c0a9c2f604f