arm64: dts: imx8mn-ddr4-evk: Remove unneeded PMIC pin configuration

The pin configuration for PMIC interrupt is already set by
imx8mn-evk.dtsi with exactly the same values.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts

@@ -153,11 +153,3 @@ ldo6_reg: LDO6 {
 		};
 	};
 };
-
-&iomuxc {
-	pinctrl_pmic: pmicirqgrp {
-		fsl,pins = <
-			MX8MN_IOMUXC_GPIO1_IO03_GPIO1_IO3	0x41
-		>;
-	};
-};