riscv: Add watchdog bindings for the k210

This adds the necessary bindings. Most of them are already there.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Acked-by: Rick Chen <rick@andestech.com>
diff --git a/arch/riscv/dts/k210.dtsi b/arch/riscv/dts/k210.dtsi
index 81b0401..0b79a29 100644
--- a/arch/riscv/dts/k210.dtsi
+++ b/arch/riscv/dts/k210.dtsi
@@ -439,7 +439,6 @@
 				interrupts = <21>;
 				clocks = <&sysclk K210_CLK_WDT0>;
 				resets = <&sysrst K210_RST_WDT0>;
-				status = "disabled";
 			};
 
 			wdt1: watchdog@50410000 {