arm64: dts: imx8mm-emcon: update pinctrl to match dtschema

The dtschema requires 'grp' in the end, so update the name
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-emcon.dtsi

@@ -124,7 +124,7 @@ MX8MM_IOMUXC_ECSPI1_MISO_ECSPI1_MISO		0x82
 		>;
 	};
 
-	pinctrl_ecspi1_cs: ecspi1-cs {
+	pinctrl_ecspi1_cs: ecspi1cs-grp {
 		fsl,pins = <
 			MX8MM_IOMUXC_ECSPI1_SS0_GPIO5_IO9		0x40000
 			MX8MM_IOMUXC_ECSPI2_SS0_GPIO5_IO13		0x40000
@@ -215,7 +215,7 @@ MX8MM_IOMUXC_SAI5_RXFS_GPIO3_IO19		0x41
 		>;
 	};
 
-	pinctrl_pmic: pmic-irq {
+	pinctrl_pmic: pmicirq-grp {
 		fsl,pins = <
 			MX8MM_IOMUXC_NAND_CE1_B_GPIO3_IO2		0x41
 		>;