Disallow reusing tokens for virtual input devices

Now the devices are successfully created but since the token is used
as a map key, the old device becomes a zombie

Also improve some messaging by s/virtual device/virtual input device

Bug: 434145006
Test: presubmit
Flag: EXEMPT trivial bugfix
Change-Id: Id112b4ad4c4d065bd2e2797b7497fb431c8df2d5