[media] Add Cinergy S2 rev.4 support

[media] Add Cinergy S2 rev.4 support

This patch derives from previous one(s) by CrazyCat. I used the commit adding rev.3 to mainline Linux kernel as an example, so credits go to its author(s).
The hardware seems to scan and tune OK.

Signed-off-by: Enrico Mioso <mrkiko.rs@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>