Change NNAPI Memory to ref-counted SharedMemory -- hal am: fadeb8a920 am: 243afb03eb

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1593091

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2c909ba2163db181e81ec4fd6c34f4dc0d4d9a65