VT-d: extend error report masking workaround to newer chipsets

VT-d: extend error report masking workaround to newer chipsets

Add two more PCI IDs to the set that has been taken care of with a
different workaround long before XSA-59, and (for constency with the
newer workarounds) log a message here too.

Also move the function wide comment to the cases it applies to; this
should really have been done by d061d200 ("VT-d: suppress UR signaling
for server chipsets").

This is CVE-2013-3495 / XSA-59.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Xiantao Zhang <xiantao.zhang@intel.com>
Acked-by: Yang Zhang <yang.z.zhang@intel.com>