Merge "Memtrack HAL: Update documentation" am: 620ad1ca3f am: 37961ff47c

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1611823

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5545dc26df7e9870003cd66cd63c171a1988fae3