Make the vendor name optional in the -m flashrom parameter when there's only

Make the vendor name optional in the -m flashrom parameter when there's only
one board name that matches. The full syntax still works, and is required
when two vendors have boards with the same names.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3082 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1