Move virtual input logic out of VDM

 - Keep the existing VDM InputController with minimal input-related
   VDM-specific functionality.
 - Move everything else to android.server.input.VirtualInputController

Purely no-op, just moving stuff around.

Renamed the VDM InputController to VirtualInputController because git
cannot have 2 files as branched from the same file and it's more useful
to see the changes on the input side.

Bug: 419493538
Test: atest & presubmit
Flag: EXEMPT no-op refactor
Change-Id: Iee237a0cb329d7807c6e847c94fd9bd79b8dfd1f