dt-binding: memory: pl353-smc: Fix the NAND controller node in the example

To be fully valid, the NAND controller node in the example should be
named nand-controller instead of flash, should be at the address @0,0
instead of @e1000000 and should have a couple of:
- #address-cells
- #size-cells
properties.

The label is being renamed nfc0 as well which is more usual than nand_0.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210610082040.2075611-8-miquel.raynal@bootlin.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt

@@ -35,8 +35,10 @@ Example:
 			  0x1 0x0 0xe2000000 0x2000000 /* SRAM/NOR CS0 region */
 			  0x2 0x0 0xe4000000 0x2000000>; /* SRAM/NOR CS1 region */
 
-		nand_0: flash@e1000000 {
+		nfc0: nand-controller@0,0 {
 			compatible = "arm,pl353-nand-r2p1";
 			reg = <0 0 0x1000000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
 		};
 	};