qlnxe: Fix build with INET

opt_inet.h is missing from 5684c8783b64, thus actually #ifdef INET
does not work.

PR: 287445
See also: https://redmine.pfsense.org/issues/16248
Reviewed by: kbowling
Tested by: leper <leper4@protonmail.com>
Fixes: 5684c8783b64 qlnxe: Add missing #ifdef INET to fix amd64 LINT-NOINET/NOIP builds
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D51295