V4L/DVB (13577): [PATCH] dvb-usb-friio: accept center-shifted frequency

This patch adds a fix to accept frequency with its center shifted.

The driver used to accept center frequencies of the normal UHF band channels,
but in ISDB-T, center frequency is shifted with 1/7MHz.
It was shifted internally in the driver,
but this patch enables to accept both types of frequency.

Signed-off-by: Akihiro Tsukada <tskd2@yahoo.co.jp>
Signed-off-by: Patrick Boettcher <pboettcher@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>