inpcb: Remove some unused parameters in internal hash lookup functions

in_pcblookup_hash_wild_* looks up unconnected inpcbs, so there is no
point in passing the foreign address and port, and indeed those
parameters are not used. So, remove them.

No functional change intended.

MFC after: 1 week
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D47385