Merge "libbinder: limit RpcTransport visibility" am: 4874ba4d53 am: 21e4bf382a am: d6459e8252

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2603985

Change-Id: I2f339ee6773b549c0aa59361f798c696e7500ed3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>