Merge "Add OWNERS for libstagefright" am: 2b25d86af5 am: 8e578c48c4 am: 50af31ba90

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1393553

Change-Id: I18d93c309a39538b96b1dcc2950f9deb2f43f88b