Merge "libmediadrm error reporting doc (U)" am: aca826f7 am: 573e9490 am: 05d6ba83

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



Change-Id: I05b534bb190f4a842f2553816bd4e1a61a80087f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>