Merge "libbinder: RPC mThreadState -> mConnections" am: a25b012056 am: 53ad1b320c am: 41303f8d6b am: 65c943e4e9

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1843848

Change-Id: Ib6fb528e742fcec7cfeea9f37fca8763ede0e523