staging: mt7621-dts: use standard 'groups' instead of 'group' for pinctrl bindings

Pinctrl generic functions looks for standard property 'groups' in DT to get
data and use in the driver. Change all of them.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-dts/gbpc1.dts

@@ -136,8 +136,8 @@ phy1: ethernet-phy@1 {
 &pinctrl {
 	state_default: pinctrl0 {
 		gpio {
-			ralink,group = "wdt", "rgmii2", "uart3";
-			ralink,function = "gpio";
+			groups = "wdt", "rgmii2", "uart3";
+			function = "gpio";
 		};
 	};
 };

drivers/staging/mt7621-dts/mt7621.dtsi

@@ -204,82 +204,82 @@ state_default: pinctrl0 {
 
 		i2c_pins: i2c0 {
 			i2c0 {
-				group = "i2c";
+				groups = "i2c";
 				function = "i2c";
 			};
 		};
 
 		spi_pins: spi0 {
 			spi0 {
-				group = "spi";
+				groups = "spi";
 				function = "spi";
 			};
 		};
 
 		uart1_pins: uart1 {
 			uart1 {
-				group = "uart1";
+				groups = "uart1";
 				function = "uart1";
 			};
 		};
 
 		uart2_pins: uart2 {
 			uart2 {
-				group = "uart2";
+				groups = "uart2";
 				function = "uart2";
 			};
 		};
 
 		uart3_pins: uart3 {
 			uart3 {
-				group = "uart3";
+				groups = "uart3";
 				function = "uart3";
 			};
 		};
 
 		rgmii1_pins: rgmii1 {
 			rgmii1 {
-				group = "rgmii1";
+				groups = "rgmii1";
 				function = "rgmii1";
 			};
 		};
 
 		rgmii2_pins: rgmii2 {
 			rgmii2 {
-				group = "rgmii2";
+				groups = "rgmii2";
 				function = "rgmii2";
 			};
 		};
 
 		mdio_pins: mdio0 {
 			mdio0 {
-				group = "mdio";
+				groups = "mdio";
 				function = "mdio";
 			};
 		};
 
 		pcie_pins: pcie0 {
 			pcie0 {
-				group = "pcie";
+				groups = "pcie";
 				function = "pcie rst";
 			};
 		};
 
 		nand_pins: nand0 {
 			spi-nand {
-				group = "spi";
+				groups = "spi";
 				function = "nand1";
 			};
 
 			sdhci-nand {
-				group = "sdhci";
+				groups = "sdhci";
 				function = "nand2";
 			};
 		};
 
 		sdhci_pins: sdhci0 {
 			sdhci0 {
-				group = "sdhci";
+				groups = "sdhci";
 				function = "sdhci";
 			};
 		};