[media] m88ds3103: fix bug on .set_tone()

Band switching didn't worked always reliably as there was one
register bit set wrong.

Thanks to Robert Schlabbach for pointing this bug and solution.

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