[MYON2][BOARD] Remove old way of setting revision-specific overlays
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mentioned in commit clea-os/layers/seco/meta-seco-imx@920e7c69
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mentioned in merge request clea-os/layers/seco/meta-seco-imx!464 (merged)
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mentioned in commit clea-os/seco-manifest@a01d176d
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mentioned in commit clea-os/layers/seco/meta-seco-imx@0dd40e63
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mentioned in commit clea-os/seco-manifest@25b0a5d7