ARM: dts: sunxi: Conform to DT spec for NAND controller

The NAND controller node name should be nand-controller and not nand as we
used previously according to the devicetree specification. Let's fix our
DTs.
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun4i-a10.dtsi

@@ -267,7 +267,7 @@ dma: dma-controller@1c02000 {
 			#dma-cells = <2>;
 		};
 
-		nfc: nand@1c03000 {
+		nfc: nand-controller@1c03000 {
 			compatible = "allwinner,sun4i-a10-nand";
 			reg = <0x01c03000 0x1000>;
 			interrupts = <37>;

arch/arm/boot/dts/sun5i.dtsi

@@ -189,7 +189,7 @@ dma: dma-controller@1c02000 {
 			#dma-cells = <2>;
 		};
 
-		nfc: nand@1c03000 {
+		nfc: nand-controller@1c03000 {
 			compatible = "allwinner,sun4i-a10-nand";
 			reg = <0x01c03000 0x1000>;
 			interrupts = <37>;

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -333,7 +333,7 @@ dma: dma-controller@1c02000 {
 			#dma-cells = <2>;
 		};
 
-		nfc: nand@1c03000 {
+		nfc: nand-controller@1c03000 {
 			compatible = "allwinner,sun4i-a10-nand";
 			reg = <0x01c03000 0x1000>;
 			interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;

arch/arm/boot/dts/sun8i-a23-a33.dtsi

@@ -161,7 +161,7 @@ dma: dma-controller@1c02000 {
 			#dma-cells = <1>;
 		};
 
-		nfc: nand@1c03000 {
+		nfc: nand-controller@1c03000 {
 			compatible = "allwinner,sun4i-a10-nand";
 			reg = <0x01c03000 0x1000>;
 			interrupts = <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>;