arm64: dts: freescale: align watchdog node name with dtschema

The dtschema expects watchdog device node name to be "watchdog":

  arch/arm64/boot/dts/freescale/fsl-ls1012a-frdm.dt.yaml: wdog@2ad0000:
    $nodename:0: 'wdog@2ad0000' does not match '^watchdog(@.*|-[0-9a-f])?$'
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi

@@ -401,7 +401,7 @@ gpio1: gpio@2310000 {
 			#interrupt-cells = <2>;
 		};
 
-		wdog0: wdog@2ad0000 {
+		wdog0: watchdog@2ad0000 {
 			compatible = "fsl,ls1012a-wdt",
 				     "fsl,imx21-wdt";
 			reg = <0x0 0x2ad0000 0x0 0x10000>;

arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi

@@ -725,7 +725,7 @@ lpuart5: serial@29a0000 {
 			status = "disabled";
 		};
 
-		wdog0: wdog@2ad0000 {
+		wdog0: watchdog@2ad0000 {
 			compatible = "fsl,ls1043a-wdt", "fsl,imx21-wdt";
 			reg = <0x0 0x2ad0000 0x0 0x10000>;
 			interrupts = <0 83 0x4>;