Merge "Add a direct API for memory balloon control" into main am: bc8160e0f7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3174019

Change-Id: I43a4b64322018328a12f73fb8b73abd3ff4ad270
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>