[LinuxBIOS] [PATCH] flashrom: Support for MCP55 and SST49LFXXXC chips

[Uwe Hermann]

Add support for the SST-49LF004C, SST-49LF008C, SST-49LF016C in flashrom.
Also add suport for NVIDIA MCP55.

Signed-off-by: Yinghai Lu 
Signed-off-by: Uwe Hermann

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I tried to extract only the relevant changes out of Yinghai's code.
Please review (especially check whether I forgot some code) and test
whether it works.

Uwe.