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[KERNEL][FIRMWARE] add i.MX{6,8} sdma firmware blob inside kernel image

Gianfranco Mariotti requested to merge kirkstone-gm_sdma into kirkstone

The sdma firmware takes ~1 minute to load from filesystem at boot, causing a kernel panic or lockup whenever the dma is used (read/write from a serial port, aplay...) before the loading is complete. Allow early loading of the firmware blob by including it into the kernel binary, so the dma is ready when needed.

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