V4L/DVB (8295): sms1xxx: add debug module option, to enable debug messages

All dmesg spam turned off by default, for now.  Values for debug:

(info=1, adv=2 (or-able)

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>