Make virtual_device_service accessible from CTS

This is safe because methods in VirtualDeviceManager are guarded by
the internal|role permission CREATE_VIRTUAL_DEVICE, and all subseuqent
methods can only be called on the returned binder.

Fixes: 209527778
Test: Manual
Change-Id: I60a5cf76eec1e45803cf09ab4924331f7c12ced4
1 file changed