Integrate meta-seco-imx/kirkstone-gm_sdma

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/4b98ac1f17f3594fc8c2f852d041189ee09ba483

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

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.