Merge "C2 VTS: Use string::compare instead of string::find to match mime" am: 0eadcf3fe0 am: 40b166a6d9

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1781469

Change-Id: I6aa6a3d9a049ed16585d54773d6fafb17378176d