Merge "Allow mediacodec to allocate from the DMA-BUF system heap" am: cf7118cc65 am: 6c6a476983 am: de21684a1b

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/1550519

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic3b9bc0fab5674f3f9dff254189ea603c29785b7