Merge "Memtrack HAL: Remove MemtrackType::NUM_TYPES" am: 5a52686fd6

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1587451

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iae0d8557806b228a383b6359b3ef0a633eb093a1