[pvmfw][vmbase] Move MemoryTracker to vmbase for reuse am: 93ee98acfc

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2617870

Change-Id: I64d25eb0792e37207feffd133e61a938e8deda8d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>