arm64/arm: dts: marvell: Rename "nand-rb" pinctrl node names

Update the "nand-rb" pinctrl child node names to use the defined "-pins"
suffix fixing DT schema warnings.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

arch/arm/boot/dts/marvell/armada-38x.dtsi

···
 					marvell,function = "dev";
 				};
 
-				nand_rb: nand-rb {
+				nand_rb: nand-rb-pins {
 					marvell,pins = "mpp41";
 					marvell,function = "nand";
 				};

arch/arm/boot/dts/marvell/armada-xp-98dx3236.dtsi

···
 		marvell,function = "dev";
 	};
 
-	nand_rb: nand-rb {
+	nand_rb: nand-rb-pins {
 		marvell,pins = "mpp19";
 		marvell,function = "nand";
 	};

arch/arm64/boot/dts/marvell/armada-70x0.dtsi

···
 			marvell,function = "dev";
 		};
 
-		nand_rb: nand-rb {
+		nand_rb: nand-rb-pins {
 			marvell,pins = "mpp13";
 			marvell,function = "nf";
 		};

arch/arm64/boot/dts/marvell/armada-80x0.dtsi

···
 			marvell,function = "dev";
 		};
 
-		nand_rb: nand-rb {
+		nand_rb: nand-rb-pins {
 			marvell,pins = "mpp13", "mpp12";
 			marvell,function = "nf";
 		};

arch/arm64/boot/dts/marvell/cn9130-db.dtsi

···
 				       "mpp27";
 			marvell,function = "dev";
 		};
-		nand_rb: nand-rb {
+		nand_rb: nand-rb-pins {
 			marvell,pins = "mpp13";
 			marvell,function = "nf";
 		};