Integrate meta-seconorth-machine/kirkstone-disable-uboot-console

Commit: seco-ne/yocto/layers/meta-seconorth-machine@c9a29804

machines: also build u-boot with disabled console

Added sd_no_console to UBOOT_CONFIG and set corresponding defconfig for machines, that use u-boot: seco-mx6 seco-mx8mm seco-mx8mp

Signed-off-by: Mikhail Vanyulin mikhail.vanyulin@rtsoft.de

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Commit: seco-ne/yocto/layers/meta-seconorth-machine@4a20d6ca

imx-boot: support multiple u-boot configs

UBOOT_CONFIG variable can hold multiple values. Redefined base build steps to support that. As a result - multiple imx-boot binaries will be generated: imx-boot-seco-mx8mm-sd.bin-flash_evk imx-boot-seco-mx8mm-sd.bin-flash_evk.tar.gz imx-boot-seco-mx8mm-sd_no_console.bin-flash_evk imx-boot-seco-mx8mm-sd_no_console.bin-flash_evk.tar.gz

The short link to the u-boot tar.gz is also created for all variants (with a little hacky name creation).