Merge "libbinder: cache interface descriptor if empty" am: 6f69c67d am: 7ca6c260

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



Change-Id: Ib524d9ba04c722478d90f050efb4f2d993f3fcf6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>