Integrate uboot-imx-kuk/add_leds_to_mc3

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@5682c066

dts:mc3: Added status and error LEDs

BCS 746-000956

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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@37f22694

defconfig:tr8plus: Added LED commands to config