arm64: dts: hi6220: enable watchdog

This patch is to add watchdog binding for Hi6220 on Hikey board.
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

@@ -815,6 +815,14 @@ dwmmc_2: dwmmc2@f723f000 {
 			pinctrl-1 = <&sdio_pmx_idle &sdio_clk_cfg_idle &sdio_cfg_idle>;
 		};
 
+		watchdog0: watchdog@f8005000 {
+			compatible = "arm,sp805-wdt", "arm,primecell";
+			reg = <0x0 0xf8005000 0x0 0x1000>;
+			interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ao_ctrl HI6220_WDT0_PCLK>;
+			clock-names = "apb_pclk";
+		};
+
 		tsensor: tsensor@0,f7030700 {
 			compatible = "hisilicon,tsensor";
 			reg = <0x0 0xf7030700 0x0 0x1000>;