Merge "C2 VTS: Use string::compare instead of string::find to match mime" into sc-dev am: 951bd894dd am: 8bf7d2b2e5

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

Change-Id: I280c97b7226bea2f419f5cb4cca9c468d59da440