Add config and overlay support for the SCD4X CO2 sensors #4156

Job	Run time
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	22m 6s
build (arm64, arm64, defconfig, kernel8)	18m 42s
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	21m 56s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	18m 30s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	21m 37s
build (bcm2835, arm, bcm2835_defconfig, kernel)	6m 22s
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	21m 34s
	2h 10m 47s

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