Only pass one PCI ID to relevant_vgpu_types

Signed-off-by: John Else <john.else@citrix.com>
Take subsystem device ID into account in relevant_vgpu_types

If the VGPU config file specifies a particular physical subsystem ID,
then the device must have the same ID for that VGPU configuration to be
supported.

If the config file doesn't specify a physical subsystem ID, then the ID
of the device doesn't matter.

Signed-off-by: John Else <john.else@citrix.com>