superiotool: Don't skip probing on a port if a a chip was detected on another port.

superiotool: Don't skip probing on a port if a a chip was detected on another port.
Only skip probing if chip was found on the same port already to avoid
duplicates.
Signed-off-by: Stefan Reinauer <stepan@coreboot.org>
Acked-by: Stefan Reinauer <stepan@coreboot.org>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6222 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1