add crosvm to com.android.virt am: 20e7835d75 am: 620b4367f2

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bitflags/+/1527444

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id49bd915bf088e2eaa1dc889800615fa3722026b