ba10_tv_box: Drop gpio section

As this board has no usable io pins

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
ba10_tv_box: Add wifi rfkill functionality

This is useful to have as the device has wired ethernet too, and it
also has a wifi status led which goes on/off together with the wifi.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>