Merge "Update custom_vm.md about Google virt apex" into main am: 792bff7b3f am: 84787971a3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3107661

Change-Id: Ia9c7442d65aba714889a751c0810e7d12e0c1a07
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>