SDMA firmware

Epic: https://source.puri.sm/Librem5/use-cases/issues/110

The imx sdma engine can load updated firmware for dma transfers but it also has a ROM fallback

imx-sdma 302c0000.sdma: external firmware not found, using ROM firmware

There is also the possibility of writing custom sdma "scripts" so we could use open source firmware in the future.

http://billauer.co.il/blog/2011/10/imx-sdma-howto-assembler-linux/

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At least the firmware-imx-7.5.bin NXP package doesn't seem to include sdma firmware for imx8m. Is that the latest one? Is "fsl,imx8mq-sdma" currently only described "just in case"?

The imx8mq uses the sdma-imx7d.bin firmware blob. So far I haven't found a situation that requires the firmware to be loaded. The rom version has sufficed so far.

I'm hoping the current sound issues aren't related to using the rom firmware.

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