Change in coreboot[master]: soc/amd/common/block/lpc/spi_dma: Implement SPI DMA functionality

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Furquan Shaikh, Marshall Dawson, Julius Werner, Eric Peers, Karthik Ramasubramanian.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56228 )

Change subject: soc/amd/common/block/lpc/spi_dma: Implement SPI DMA functionality
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Patch Set 6:

(1 comment)

File src/soc/amd/common/block/lpc/Kconfig:

https://review.coreboot.org/c/coreboot/+/56228/comment/8c7a8897_809a3b78 
PS6, Line 15: The SPI DMA controller
            : 	  is only functional on Cezanne, Renoir or later SoCs.
> > I guess I could do a `depends on !SOC_AMD_PICASSO and !SOC_AMD_STONEYRIDGE`. […]

i'd like to avoid to have checks for specific socs in the common code. only selecting it form the socs that support this and having the info that it won't work on the older ones in the help text is imho a much cleaner and better solution