SECO ASTRID (SBC-C61): linux-seco and u-boot-astrid: Update the licenses

License GPLv2 is obsolete:

WARNING: linux-seco-5.10.35+gitAUTOINC+6722bbc49b-r0 do_package_qa: QA Issue: Recipe LICENSE includes obsolete licenses GPLv2 [obsolete-license] WARNING: u-boot-astrid-v2022.04+gitAUTOINC+01f1ab67f3-r0 do_package_qa: QA Issue: Recipe LICENSE includes obsolete licenses GPLv2+ [obsolete-license]

Update License to GPL-2.0-only

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