[media] siano: replace sms_warn() by pr_warn()

There's no reason for a sms' own sms_warn macro. Just replace
it by the standard pr_warn().

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/common/siano/smscoreapi.h
Simple merge

diff --cc drivers/media/usb/siano/smsusb.c
Simple merge