Merge "libmediadrm error reporting doc (U)" am: aca826f7 am: 573e9490

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2399772



Change-Id: Idf85a7c738855ec0e2e50abccf58e311e1ec51f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>