Staging: rt3070: update allowed channels list for Japan

rt3070 driver allows use of 5G channel 34 while rt{286,287,309}0
drivers don't and quick googling seems to confirm the limitation.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>