arm64: dts: visconti: Add watchdog support for TMPV7708 SoC

Add watchdog node in TMPV7708's dtsi, and tmpv7708-rm-mbrc boards's
dts.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>

arch/arm64/boot/dts/toshiba/tmpv7708-rm-mbrc.dts

@@ -41,3 +41,8 @@
 	clocks = <&uart_clk>;
 	clock-names = "apb_pclk";
 };
+
+&wdt {
+	status = "okay";
+	clocks = <&wdt_clk>;
+};

arch/arm64/boot/dts/toshiba/tmpv7708.dtsi

@@ -134,6 +134,12 @@
 		#clock-cells = <0>;
 	};
 
+	wdt_clk: wdt-clk {
+		compatible = "fixed-clock";
+		clock-frequency = <150000000>;
+		#clock-cells = <0>;
+	};
+
 	soc {
 		#address-cells = <2>;
 		#size-cells = <2>;
@@ -384,6 +390,12 @@
 			#size-cells = <0>;
 			status = "disabled";
 		};
+
+		wdt: wdt@28330000 {
+			compatible = "toshiba,visconti-wdt";
+			reg = <0 0x28330000 0 0x1000>;
+			status = "disabled";
+		};
 	};
 };