staging: vt6656: device_init_registers move out vnt_set_bss_mode

Move to vnt_add_interface and allow to refresh at the start
of every software scan in vnt_sw_scan_start

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>