ANDROID: trace: net: use %pK for kernel pointers

We want to use network trace events in production
builds, to help diagnose Wifi problems. However, we
don't want to expose raw kernel pointers in such
builds.

Change the format specifier for the skbaddr field,
so that, if kptr_restrict is enabled, the pointers
will be reported as 0.

Bug: 30090733
Change-Id: Ic4bd583d37af6637343601feca875ee24479ddff
Signed-off-by: mukesh agrawal <quiche@google.com>