[media] stv090x: get rid of continuation lines

This driver has printk continuation lines for debugging purposes.
Since commit 56387331 ("Merge branch 'printk-cleanups'")',
this won't work as expected anymore.

So, use %*ph and get rid of it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>