staging: xgifb: checkpatch cleanup printk() -> pr_lvl()

Rewrote code to use pr_lvl() instead of printk().  There are still a few
instances of printk(), mainly in the debug code which looks like it's going to
be dropped/rewrote (most of it is blocked out).

Signed-off-by: Sam Hansen <solid.se7en@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>