Replace CDM association ID with VDM device ID.

Whenever the association ID is used as a map key in VDM. This allows
for multiple virtual devices for the same association and loosens the
coupling between CDM and VDM.

Bug: 262240190
Test: atest VirtualDeviceManagerServiceTest

Change-Id: Id232251377e68daaee02fe90c4f8f10d3dc45c81