hangcheck-timer: replace printk(KERN_CRIT) with pr_crit

Replace printk(KERN_CRIT ...) with pr_crit(...) and printk() with
pr_debug(). The change aims to make logging more consistent and
readable.

Signed-off-by: Clint George <clintbgeorge@gmail.com>
Link: https://patch.msgid.link/20251111151340.9162-2-clintbgeorge@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>