[media] rtl2832: provide muxed I2C adapter

RTL2832 provides gated / repeater I2C adapter for tuner.
Implement it as a muxed I2C adapter.

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

diff --cc drivers/media/dvb-frontends/Kconfig
Simple merge

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