[media] drx-j: get rid of tuner dummy get/set frequency

Those functions will never be used with Linux DVB binding.

Get rid of them.

Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/dvb-frontends/drx39xyj/drx39xxj_dummy.c
Simple merge

diff --cc drivers/media/dvb-frontends/drx39xyj/drx_driver.h
Simple merge

diff --cc drivers/media/dvb-frontends/drx39xyj/drxj.c
Simple merge