change eMMC enumeration for EDGEHOG:

eMMC <== is dev 0
uSD  <== is dev 1

	modified:   arch/arm/dts/seco-imx8mm-c72.dts
	modified:   arch/arm/dts/seco-imx8mn-c72.dts
	modified:   board/seco/imx8mm_c72/imx8mm_c72.c
	modified:   board/seco/imx8mn_c72/imx8mn_c72.c
	modified:   include/configs/seco_imx8mm_c72.h
	modified:   include/configs/seco_imx8mn_c72.h