Merge "libbinder: keep uninit descriptor empty" into udc-dev am: aa34914e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22979800



Change-Id: I9b90e7839960f35bc846567e40f43a5cee483e3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>