imx8mguf:release artefacts: Fix append syntax so all needed artefacts are copied
Use _append_mx8 instead of +=, as the previous way didn't really appended but overwrote the variable content. This leaded to some missing files in the release.
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Use _append_mx8 instead of +=, as the previous way didn't really appended but overwrote the variable content. This leaded to some missing files in the release.