Merge "Memtrack HAL: Update documentation" am: 620ad1ca3f am: 37961ff47c am: 9c570e0cd3

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I03528969319fbe6207cd677cf47e0b3940b70e0e