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

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

Change-Id: I7418b7819a7ef9fe64efd8a143f456bf6411a15a