security: networking: use %pK instead of %p

An information disclosure vulnerability in kernel components in the
networking subsystem could enable a local malicious application to
access data outside of its permission levels.

The fix is designed to use %pK instead of %p, which also evaluates
whether kptr_restrict is set.

Change-Id: Iace1978dbd6c2a56cce29d932d770859bd5fa037