ARM: dts: r7s72100: Add watchdog timer

Add watchdog timer support for RZ/A1.
For the RZ/A1, the only way to do a reset is to overflow the WDT, so this
is useful even if you don't need the watchdog functionality.

Signed-off-by: Chris Brandt <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Guenter Roeck <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

arch/arm/boot/dts/r7s72100.dtsi

···
 			<0xe8202000 0x1000>;
 	};
 
+	wdt: watchdog@fcfe0000 {
+		compatible = "renesas,r7s72100-wdt", "renesas,rza-wdt";
+		reg = <0xfcfe0000 0x6>;
+		interrupts = <GIC_SPI 106 IRQ_TYPE_EDGE_RISING>;
+		clocks = <&p0_clk>;
+	};
+
 	i2c0: i2c@fcfee000 {
 		#address-cells = <1>;
 		#size-cells = <0>;