[C72 Nano] [i.MX8Mn] add BUCK3 configuration
add RAM regulator BUCK3 configuration (BUCK5 in schematic)
modified: arch/arm64/boot/dts/seco/seco-imx8mn-c72.dts
add RAM regulator BUCK3 configuration (BUCK5 in schematic)
modified: arch/arm64/boot/dts/seco/seco-imx8mn-c72.dts