if_pflog: Explicitly depend on "pf" and various cleanups
* Explicitly depend on the "pf" module to make sure it is initialized
later than the "pf" main module.
* Fix a missing lwkt token release in pflog_clone_create().
* Remove unnecessary kmalloc() check.
* Use if_initname() to properly set up if_{xname,dname,dunit}.
* Use pflogattach() in module load event handle.
* Staticize functions and variables.
* Remove the unused pflogrtrequest() function.
* Remove the "old_pfloghdr" struct from if_pflog.h.
* Mark some __unused variables.
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