Merge "NdkMediaDrm: send provision event with 0 data" am: facb434dc1 am: f36125feba am: c0bf3358d2

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

Change-Id: I43d9408c2e2a365ced30e9e9c89a609f43776b4b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>