List AMD SB850 as supported (it has the same PCI ID as SB700)

Success report at
http://flashrom.org/pipermail/flashrom/2011-March/006072.html

Corresponding to flashrom svn r1285.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Idwer Vollering <vidwer@gmail.com>
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