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mx8m:bootscript-uboot: Apply temperature grade overlays

Felix Gerking requested to merge mx8m_temp_grade_overlays into kirkstone

The bootscript checks now if the cpu_temp_grade var is set in the u-boot environment. If so, the script tries to load the corresponding overlay. According to the u-boot cpu_get_temp_grade function, the critical extended commercial temp is equal to the industrial temp. Therefore, the industrial overlay is also applied for the extended commercial grade. Deploy industrial temp overlay for mx8mp and mx8mm. The automotive overlay is not deployed, since mx8mp and mx8mm SoCs are only available in consumer and industrial versions at the moment. The default values in the devicetree match the consumer/commercial grade.

BCS 746-001385

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