arm64: dts: add big-endian property back into watchdog node

Watchdog doesn't work on NXP ls1046ardb board because in commit
7c8ffc5("arm64: dts: layerscape: remove big-endian for mmc nodes"),
it intended to remove the big-endian from mmc node, but the big-endian of
watchdog node is also removed by accident. So, add watchdog big-endian
property back.

In addition, add compatible string fsl,ls1046a-wdt, which allow big-endian
property.

Fixes: 7c8ffc5 ("arm64: dts: layerscape: remove big-endian for mmc nodes")
Cc: [email protected]
Signed-off-by: Meng Li <[email protected]>
Reviewed-by: Ahmad Fatoum <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: limeng-linux

arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi

@@ -687,11 +687,12 @@
 		};
 
 		wdog0: watchdog@2ad0000 {
-			compatible = "fsl,imx21-wdt";
+			compatible = "fsl,ls1046a-wdt", "fsl,imx21-wdt";
 			reg = <0x0 0x2ad0000 0x0 0x10000>;
 			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&clockgen QORIQ_CLK_PLATFORM_PLL
 					    QORIQ_CLK_PLL_DIV(2)>;
+			big-endian;
 		};
 
 		edma0: dma-controller@2c00000 {