AIDL BufferPool implementation (HIDL -> AIDL) am: 8878a13271

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2680664

Change-Id: Ie58b365383d0dc48090004d83d639d1f8466b342
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>