V4L/DVB (3414): Saa7134: document that there's also a 220RF from KWorld

I have the same card with the same PCI id, but from KWorld.
The patch documents that this is the same card.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>