ARM: dts: sun9i: Add missing watchdog clocks

The watchdog has a clock, but it wasn't always listed.  Add it to the
devicetree where it's missing.
Signed-off-by: Maxime Ripard <mripard@kernel.org>

arch/arm/boot/dts/sun9i-a80.dtsi

@@ -942,6 +942,7 @@ wdt: watchdog@6000ca0 {
 			compatible = "allwinner,sun6i-a31-wdt";
 			reg = <0x06000ca0 0x20>;
 			interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&osc24M>;
 		};
 
 		pio: pinctrl@6000800 {
@@ -1149,6 +1150,7 @@ r_wdt: watchdog@8001000 {
 			compatible = "allwinner,sun6i-a31-wdt";
 			reg = <0x08001000 0x20>;
 			interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&osc24M>;
 		};
 
 		prcm@8001400 {