Add support for the AMD/ATI SB600 southbridge SPI functionality.
This has been tested by Uwe Hermann on an RS690/SB600 board.
Signed-off-by: Jason Wang <Qingpei.Wang@amd.com>
Reviewed-by: Joe Bao <zheng.bao@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
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