ARM: dts: aspeed-g6: Fix EMMC function in pinctrl dtsi

The binding was updated to better reflect the intended use of the
hardware and the existing function/groups for SD3 were dropped.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g6-pinctrl.dtsi

@@ -852,14 +852,9 @@ pinctrl_sd2_default: sd2_default {
 		groups = "SD2";
 	};
 
-	pinctrl_sd3_default: sd3_default {
-		function = "SD3";
-		groups = "SD3";
-	};
-
 	pinctrl_emmc_default: emmc_default {
-		function = "SD3";
-		groups = "EMMC";
+		function = "EMMC";
+		groups = "EMMCG4";
 	};
 
 	pinctrl_sgpm1_default: sgpm1_default {