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The SST39LF series has the same IDs. Add short AMIC vendor ID to
flashrom.

Corresponding to flashrom svn r225 and coreboot v2 svn r3299.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>