arm64: dts: marvell: Fix A37xx UART0 register size

Armada-37xx UART0 registers are 0x200 bytes wide. Right next to them are
the UART1 registers that should not be declared in this node.

Update the example in DT bindings document accordingly.
Signed-off-by: Nallen yan <yanwei@marvell.com>
Signed-off-by: NMiquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

Documentation/devicetree/bindings/serial/mvebu-uart.txt

@@ -8,6 +8,6 @@ Required properties:
 Example:
 	serial@12000 {
 		compatible = "marvell,armada-3700-uart";
-		reg = <0x12000 0x400>;
+		reg = <0x12000 0x200>;
 		interrupts = <43>;
 	};

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -134,7 +134,7 @@
 
 			uart0: serial@12000 {
 				compatible = "marvell,armada-3700-uart";
-				reg = <0x12000 0x400>;
+				reg = <0x12000 0x200>;
 				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
 				status = "disabled";
 			};