ARM: dts: BCM63xx: re-parent NAND controller node

The NAND controller is a child node of the UBUS (legacy) bus, not the
AXI (new) bus, re-parent the NAND controller node accordingly. This was
a mistake introduced by a failed merge of this NAND node with other
changes (PMB).

Fixes: b5762cac ("ARM: bcm63138: add NAND DT support")
Reported-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm63138.dtsi

@@ -120,17 +120,6 @@ pmb1: reset-controller@4800e0 {
 			reg = <0x4800e0 0x10>;
 			#reset-cells = <2>;
 		};
-
-		nand: nand@2000 {
-			#address-cells = <1>;
-			#size-cells = <0>;
-			compatible = "brcm,nand-bcm63138", "brcm,brcmnand-v7.0", "brcm,brcmnand";
-			reg = <0x2000 0x600>, <0xf0 0x10>;
-			reg-names = "nand", "nand-int-base";
-			status = "disabled";
-			interrupts = <GIC_SPI 38 0>;
-			interrupt-names = "nand";
-		};
 	};
 
 	/* Legacy UBUS base */
@@ -163,6 +152,17 @@ serial1: serial@620 {
 			status = "disabled";
 		};
 
+		nand: nand@2000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "brcm,nand-bcm63138", "brcm,brcmnand-v7.0", "brcm,brcmnand";
+			reg = <0x2000 0x600>, <0xf0 0x10>;
+			reg-names = "nand", "nand-int-base";
+			status = "disabled";
+			interrupts = <GIC_SPI 38 0>;
+			interrupt-names = "nand";
+		};
+
 		bootlut: bootlut@8000 {
 			compatible = "brcm,bcm63138-bootlut";
 			reg = <0x8000 0x50>;