Merge "libbinder: RPC more nodiscard w/ fix" am: 5f414cf35e am: 0f702b522f am: e4a5d76828

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1870033

Change-Id: If2b0b76c60aa43a0ede9edc8c8ecff96237a1dd0