v4l-dm800 siano: always load smsdvb

Backport patch into v4l.

[media] siano: always load smsdvb
Without smsdvb, the driver actually does nothing, as it lacks the userspace API. While I wrote it independently, in order to make a sms2270 board I have here to work, this patch is functionally identical to this patch from Doron Cohen: http://patchwork.linuxtv.org/patch/7894/

Patches for newer kernels (<3.7 && >=3.7) is available here: http://openpli.org/forums/topic/31523-august-dvb-t202-tuner/page-2#entry396227
Above patch obsoletes patch fix-dvb-siano-sms-order.patch