Merge "BpBinder: hide 'handle' API" am: e7539dd457 am: 536bf4c800

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1533425

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia04b59ec10923f0b92a6d9ee3a86b27d140834ee