Merge "RpcBinder: Add AF_UNIX socketpair transport" am: 08178a7279

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2229557

Change-Id: Idf47dba11dc8d390354bd0b0b01ab24559851158
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>