Merge "C2 VTS: Use string::compare instead of string::find to match mime" into sc-dev am: 951bd894dd am: de3941cbfa am: 6f88bc33c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15448015

Change-Id: Id5853fecfe5bd30eff89091f6967db359caded49