codecs: add hevc helper to pre-decode the header for w/h am: 9c42d7b375

Original change: https://googleplex-android-review.googlesource.com/c/device/generic/goldfish-opengl/+/18333635

Change-Id: I59348cee57f9407915882eb00b4817076e2c7540
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>