Merge "libbinder: keep uninit descriptor empty" into udc-dev am: aa34914e am: 2b15c1a5

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



Change-Id: Iefe6afaa09efb26e2efb182d721cf1160813f51e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>