ice: Don't restart on VLAN changes
In rS360398, a new iflib device method was added with default of opt out
for VLAN events needing an interface reset.
This re-init is unnecessary for ice(4).
Sponsored by: BBOX.io
Differential Revision: https://reviews.freebsd.org/D41558
(cherry picked from commit 14a14e36aee2e6b848c239ac29090ad4cb66fbf7)