Define the vcpu stall detector node in the pvmfw DT template

The generated device tree in CrosVM is verified before passing it to the
pvmfw. Make sure that we include the vcpu stall detector node in the DT
template to probe the device.

Bug: 273440896
Test: Verify that the vcpu_stall detector node is probed in the guest
Change-Id: I6c07dec52c8db4d8cc28da7d3844513e3fea82f4
Signed-off-by: Sebastian Ene <sebastianene@google.com>
diff --git a/pvmfw/platform.dts b/pvmfw/platform.dts
index 056fa2f..127f69a 100644
--- a/pvmfw/platform.dts
+++ b/pvmfw/platform.dts
@@ -245,4 +245,11 @@
 		clock-names = "apb_pclk";
 		clocks = <&clk>;
 	};
+
+	vmwdt@3000 {
+		compatible = "qemu,vcpu-stall-detector";
+		reg = <0x00 0x3000 0x00 0x1000>;
+		clock-frequency = <10>;
+		timeout-sec = <8>;
+	};
 };