Fix up the SMSC detection code to probe _both_ old- and new-style

Fix up the SMSC detection code to probe _both_ old- and new-style
Super I/Os from SMSC. Otherwise not all of them are detected (and there
could theoretically be _two_ of them in a system, so we should probe
for both types anyway).

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2812 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1