Remove an unnecessary panic.  The PVO's PTE entry and the PTEG's PTE entry may
not match, if the PVO's PTE is invalid.
Micro-optimize OFW syscons 8-bit blank.

MFC after:	1 week
Update ciss(4) with new models of raid controllers from HP

Submitted by:	scott.benesh@hp.com
MFC after:	2 weeks
Sponsored by:	Hewlett Packard