ARM: dts: sunxi: Add missing watchdog clocks

The watchdog has a clock on all our SoCs, but it wasn't always listed.
Add it to the devicetree where it's missing.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun4i-a10.dtsi

@@ -816,6 +816,7 @@
 			compatible = "allwinner,sun4i-a10-wdt";
 			reg = <0x01c20c90 0x10>;
 			interrupts = <24>;
+			clocks = <&osc24M>;
 		};
 
 		rtc: rtc@1c20d00 {