[coreboot-gerrit] Change in coreboot[master]: soc/amd/common/block/lpc/spi_dma: Use mutex to protect DMA registers

[Furquan Shaikh (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Eric Peers, Felix Held.
Furquan Shaikh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56231 )

Change subject: soc/amd/common/block/lpc/spi_dma: Use mutex to protect DMA registers
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Patch Set 7:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/56231/comment/5dd9c942_28cda3c0 
PS7, Line 168: struct
static