UPSTREAM: selinux: Cleanup printk logging in services

Replace printk with pr_* to avoid checkpatch warnings.

Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

(cherry picked from commit b54c85c15a7bf1a34b14f23eb186e4a737ac3447)
Change-Id: Iebe62c1f94ec8dcb5c442a8f2aa3f8640029c726
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>