Merge "NdkMediaDrm: send provision event with 0 data" am: facb434dc1 am: f36125feba

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2157776

Change-Id: I01235a045c4a56d9fcdd6c5c74996093fe63e5b6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>