Merge "Memtrack HAL: Update documentation" am: 620ad1ca3f am: 37961ff47c am: 9c570e0cd3 am: ca0dd5740a

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If305df0978d3464b384b5d26bb1a2ff5c920df35