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This paves the way to have a fully generic generic_spi_command without
knowledge about any SPI controller.

The third step would be calling SPI controller functions via a function
pointer.

Corresponding to flashrom svn r224 and coreboot v2 svn r3296.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>