Add ComputerControl access to VirtualDeviceManager

New hidden API to create a VirtualDevice without a CDM association.
These APIs will only be used internally and can only accessed by holders
of the COMPUTER_CONTROL_ACCESS permission (internal|knownSigner).

Bug: 410570802
Flag: android.companion.virtualdevice.flags.computer_control_access
Test: manual
Change-Id: Id51395651c7163b7ca8e9d7aa6c3f7cdff556650