[media] mceusb: Allow a per-model device name

It is better to use a per-model device name, especially on
multi-function devices like Polaris. So, allow overriding the
default name at the mceusb model table.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>