Merge "libbinder: remove unused IPCThreadState::process" am: e818590d3e am: 6dc0104451 am: ffd0e4bb6d

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1880792

Change-Id: I4838166609e8f497d6402899b33acb391ff8c0fb