[media] support for medion dvb stick 1660:1921

[mchehab@redhat.com: The same patch were sent by Alf and by Randoslaw.
I've applied the oldest version, just fixing the entry index]

Cc: Patrick Boettcher <pboettcher@kernellabs.com>
Tested-by: James Huk <huk256@gmail.com>
Tested-by: Alf Fahland <alf-f@gmx.de>
Signed-off-by: Radoslaw Warowny <radoslaww@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>