[media] cxd2820r_c: fix if_ctl calculation
[media] cxd2820r_c: fix if_ctl calculation

fixes tuning for DVB-C

Signed-off-by: Evgeny Plehov <4b851fcd435fe768610903a1731676663b98e769@ukr.net>
Reviewed-by: Antti Palosaari <293134fe763ce2d9d8609280ea107c73cbd2eb86@iki.fi>
Signed-off-by: Michael Krufky <00524723a60798c74a43fcc620c25dd7b9ece078@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <0cae1d1e981e84d16b82ca3d17be8a7f826608d3@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs