Merge "libbinder: cache interface descriptor if empty" am: 6f69c67d9f

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2365608

Change-Id: Ifcf5eb92114787c8ea0ad3410791ad6a6181ffab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>