irdma: Convert to IfAPI

Mostly mechanical changes, with some reworking in irdma_cm for iterating
over interfaces and addresses. Further rework by Bartosz Sobczak.

Reviewed by: bartosz.sobczak_intel.com
Tested by: mateusz.moga_intel.com
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D38960