[automerger skipped] Merge "Support set active device to null." into rvc-dev am: f41c48a1 -s ours
am skip reason: Change-Id Ib4c00d75e0de0581abf993469a029e02d36d608e with SHA-1 7714f9a1 is in history
Change-Id: I42067e1d53e82ce5607256a1a191e9291083a10a