V4L/DVB (4477): Improve hardware algorithm by setting the appropriate registers

Hardware algorithm needs to be configured to:
1) Increase timeout constants, to detect weaker signals;
2) do a wider zigzag search.
Acked-by: Manu Abraham <manu@linuxtv.org>

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>