arm64: dts: imx8mq-librem5: 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/imx8mq-librem5-devkit.dts

@@ -667,7 +667,7 @@ MX8MQ_IOMUXC_SPDIF_EXT_CLK_GPIO5_IO5	0xc6  /* MIC_SEL */
 		>;
 	};
 
-	pinctrl_spkamp: spkamp {
+	pinctrl_spkamp: spkampgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SPDIF_TX_GPIO5_IO3		0x81  /* MUTE */
 		>;

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -686,7 +686,7 @@ MX8MQ_IOMUXC_SD1_RESET_B_USDHC1_RESET_B		0xc1
 		>;
 	};
 
-	pinctrl_usdhc1_100mhz: usdhc1grp100mhz {
+	pinctrl_usdhc1_100mhz: usdhc1-100mhzgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SD1_CLK_USDHC1_CLK			0x8d
 			MX8MQ_IOMUXC_SD1_CMD_USDHC1_CMD			0xcd
@@ -703,7 +703,7 @@ MX8MQ_IOMUXC_SD1_RESET_B_USDHC1_RESET_B		0xc1
 		>;
 	};
 
-	pinctrl_usdhc1_200mhz: usdhc1grp200mhz {
+	pinctrl_usdhc1_200mhz: usdhc1-200mhzgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SD1_CLK_USDHC1_CLK			0x9f
 			MX8MQ_IOMUXC_SD1_CMD_USDHC1_CMD			0xdf
@@ -733,7 +733,7 @@ MX8MQ_IOMUXC_SD2_RESET_B_USDHC2_RESET_B 0xc1
 		>;
 	};
 
-	pinctrl_usdhc2_100mhz: usdhc2grp100mhz {
+	pinctrl_usdhc2_100mhz: usdhc2-100mhzgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SD2_CD_B_GPIO2_IO12	0x80
 			MX8MQ_IOMUXC_SD2_CLK_USDHC2_CLK		0x8d
@@ -746,7 +746,7 @@ MX8MQ_IOMUXC_SD2_RESET_B_USDHC2_RESET_B 0xc1
 		>;
 	};
 
-	pinctrl_usdhc2_200mhz: usdhc2grp200mhz {
+	pinctrl_usdhc2_200mhz: usdhc2-200mhzgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SD2_CD_B_GPIO2_IO12	0x80
 			MX8MQ_IOMUXC_SD2_CLK_USDHC2_CLK		0x9f