ARM: dts: armada-38x: Add NAND RB pinctrl information

Add pin control information for the NAND flash interface.
Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

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

@@ -279,6 +279,11 @@ nand_pins: nand-pins {
 					marvell,function = "dev";
 				};
 
+				nand_rb: nand-rb {
+					marvell,pins = "mpp41";
+					marvell,function = "nand";
+				};
+
 				uart0_pins: uart-pins-0 {
 					marvell,pins = "mpp0", "mpp1";
 					marvell,function = "ua0";