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Also add suport for NVIDIA MCP55.

Corresponding to flashrom svn r85 and coreboot v2 svn r2537.
Signed-off-by: Yinghai Lu <yinghai.lu@amd.com>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Peter Stuge <peter@stuge.se>