Change in coreboot[master]: soc/amd/common/block/lpc: Add custom SPI DMA boot device

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Martin Roth, Marshall Dawson, Felix Held.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55854 )

Change subject: soc/amd/common/block/lpc: Add custom SPI DMA boot device
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Patch Set 2:

(2 comments)

File src/soc/amd/common/block/lpc/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/55854/comment/809c8803_058c2db2 
PS1, Line 16: verstage-y += spi_dma.c
> It doesn't look like this is set up for psp_verstage. […]

Done

File src/soc/amd/common/block/lpc/spi_dma.c:

https://review.coreboot.org/c/coreboot/+/55854/comment/7309c22c_cf079cfa 
PS1, Line 34: memcpy(b, &mdev->base[offset], size);
> Nit: Maybe add a comment here unless you think the other patches will be merged before long.

I'll omit the comment since the name of the method has mmap in it.