Document the rules for DMI matching with PCI subsystem IDs

The rules may change in the future, but right now it is important that
the comments match the code.

Corresponding to flashrom svn r893.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
1 file changed