Integrate gitlab-ci/add-genio510 and 1 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@4595835d

build:machines: Add Genio510 to the build job template

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@d8b5ab7b

scripts:firmware: Fix check for U-Boot file types

On i.MX6 devices, the U-Boot file types are not set at all. Extent check for
the existance of the uboot_file_types var.