[flashrom] [PATCH] split spi.c and fix include headers

[Sean Nelson]

Split spi.c into programmer and chip drivers.
Make it so flash.h doesn't include any other flashrom-related headers.
Fix includes in files.

Signed-off-by: Sean Nelson

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Made as minimal changes as I could, and split sli.c where it was clearly 
programmer code where the rest was moved to spi25.c. Names and Ideas as 
suggested by carldani.