iflib: Set the NUMA domain in receive packet headers

Reading PR 273559 made me realize that commit 767723ddebe9 is
incomplete. iflib should set the NUMA domain of received packets before
passing them to protocol layers.

PR: 273559
Reviewed by: zlei, kbowling, erj
Fixes: 767723ddebe9 ("iflib: Use if_alloc_dev() to allocate the ifnet")
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D47841

(cherry picked from commit 3d642b0f71c501dd9ee7aa0487788f619900d297)