[media] siano: use pr_* print functions

[media] siano: use pr_* print functions

Instead of defining its own set of printk functions, let's
use the common Kernel debug logic provided by pr_foo functions.

As a first step, let's just define the existing macros as the
Kernel ones.

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