add crosvm to com.android.virt

To do so, crosvm and its dependencies have the apex_available property
set to "//apex_available:platform", "com.android.virt" to explicitly
acknowledge the joining.

Bug: 174639241
Test: m com.android.virt

Change-Id: Idd7706a931fde0dfd77fe8b58f6f0c84081c6e3c
1 file changed