spelling
feedback and ok tb@ jmc@ ok ratchov@

Remove excessive sys/cdefs.h inclusion
ok guenther millert kettenis

Use the number of products in the terminating condition when iterating
through the products array not the number of vendors.
found by parfait

ok deraadt@ miod@ mglocker@

Import EDID handling code from NetBSD. Ok deraadt@, miod@, mglocker@.