V4L/DVB (5445): Added / corrected support for some ASUS hybrid boards

There are 2 new entries for p7131 boards and one correction for a board
with LNA.

Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>