5255 uts shouldn't open-code ISP2
Reviewed by: Marcel Telka <marcel@telka.sk>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>

illumos/illumos-gate@de710d24d2fae4468e64da999e1d952a247f142c