ARM: dts: rockchip: add new watchdog compatible to rk322x.dtsi

The watchdog compatible strings are suppose to be SoC orientated.
In the more recently added Rockchip rk322x.dtsi file only
the fallback string "snps,dw-wdt" is used, so add the new
compatible string:

"rockchip,rk3228-wdt", "snps,dw-wdt"

make ARCH=arm dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml

Signed-off-by: Johan Jonker <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Heiko Stuebner <[e-mail]>

arch/arm/boot/dts/rk322x.dtsi

···
 	};
 
 	wdt: watchdog@110a0000 {
-		compatible = "snps,dw-wdt";
+		compatible = "rockchip,rk3228-wdt", "snps,dw-wdt";
 		reg = <0x110a0000 0x100>;
 		interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&cru PCLK_CPU>;