arm64: dts: marvell: armada37xx: Add emmc/sdio pinctrl definition

Add emmc/sdio pinctrl definition for marvell armada37xx SoCs.
Signed-off-by: Ding Tao <miyatsu@qq.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -234,6 +234,11 @@ uart2_pins: uart2-pins {
 					groups = "uart2";
 					function = "uart";
 				};
+
+				mmc_pins: mmc-pins {
+					groups = "emmc_nb";
+					function = "emmc";
+				};
 			};
 
 			nb_pm: syscon@14000 {
@@ -266,6 +271,11 @@ rgmii_pins: mii-pins {
 					function = "mii";
 				};
 
+				sdio_pins: sdio-pins {
+					groups = "sdio_sb";
+					function = "sdio";
+				};
+
 			};
 
 			eth0: ethernet@30000 {