ARM: dts: imx6ul: add wdog3 node

The i.MX6UL(L) has a WDOG3 located at start address 0x021E0000 in the
AIPS-2 memory region [1].

[1] i.MX 6UltraLite Applications Processor Reference Manual, Rev. 1,
    04/2016, Table-2-3 AIPS-2 memory map, p. 166
Signed-off-by: NJörg Krause <joerg.krause@embedded.rocks>
Reviewed-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul.dtsi

@@ -931,6 +931,14 @@
 				status = "disabled";
 			};
 
+			wdog3: wdog@21e4000 {
+				compatible = "fsl,imx6ul-wdt", "fsl,imx21-wdt";
+				reg = <0x021e4000 0x4000>;
+				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clks IMX6UL_CLK_WDOG3>;
+				status = "disabled";
+			};
+
 			uart2: serial@21e8000 {
 				compatible = "fsl,imx6ul-uart",
 					     "fsl,imx6q-uart";