Merge "libmediadrm error reporting doc (U)" am: aca826f786

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

Change-Id: I054e777811c96bfd0cbfcb42aff38a1aaa0e0d61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>