Integrate uboot-imx-kuk/extend_bootselect_env
Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@b11d5d7b
cmd:seco_ne: Export bootmode on ENV bootselect set
The bootmode environment variable wasn't set to the new bootselect value when setting the boot order.
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Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@70b5836b
cmd:seco-ne: Add oneshot modes to ENV bootselect
Add oneshot, oneshotA and oneshotB modes to the ENV bootselect implementation.