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>

6434435 checking for interrupt thread context is broken in 1394 modules, hangs kernel
Contributed by Juergen Keil <jk@tools.de>

OpenSolaris Launch