Merge "omx: validate only standard OMX roles" into sc-dev am: af592fb1 am: aae88ba1 am: cc454944

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/15528285

Change-Id: I1b38066ba19e7a774192705881674c4e50ebc65a