Merge "Reserves memory for external buffers" into rvc-dev am: 5f86b514 am: a383eeb5 am: 7e7bb96f am: c6d7e0a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/11925286

Change-Id: I59c9df825631784393457581743fdfead278d3a9