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[KERNEL][FIRMWARE] Add i.MX8 sdma firmware blob inside kernel image

Oleksii Kutuzov requested to merge oleksii/scrathgap_kernel-fw into scarthgap

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.

Reference: 4b98ac1f

Tested on Trizeps 8 Plus and E39.

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