[media] fc2580: use regmap for register I2C access

Replace home made register access routines with regmap.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/tuners/Kconfig
Simple merge

diff --cc drivers/media/tuners/fc2580.c
Simple merge

diff --cc drivers/media/tuners/fc2580_priv.h
Simple merge