[media] rtl2832: move all configuration to platform data struct

Move all needed configuration values to platform data structure
and remove old configuration code where possible.

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

diff --cc drivers/media/dvb-frontends/rtl2832.c
Simple merge

diff --cc drivers/media/dvb-frontends/rtl2832.h
Simple merge

diff --cc drivers/media/dvb-frontends/rtl2832_priv.h
Simple merge