dts: bindings: Add Xen Platform related dts bindings

Add the Xen Platform related dts bindings.

Signed-off-by: Jaxson Han <jaxson.han@arm.com>

boards/arm64/xenvm/xenvm.dts

@@ -78,7 +78,8 @@
 	};
 
 	xen_hvc: hvc {
-		compatible = "xen,uart_hvc";
+		compatible = "xen,hvc-uart";
 		status = "okay";
+		label = "UART_HVC";
 	};
 };

boards/arm64/xenvm/xenvm.yaml

@@ -0,0 +1,8 @@
+identifier: xenvm
+name: ARMv8 Xen Virtual Machine
+type: mcu
+arch: arm64
+toolchain:
+  - zephyr
+  - cross-compile
+ram: 16384

boards/arm64/xenvm/xenvm_gicv3.yaml

@@ -0,0 +1,8 @@
+identifier: xenvm_gicv3
+name: ARMv8 Xen Virtual Machine With GICv3
+type: mcu
+arch: arm64
+toolchain:
+  - zephyr
+  - cross-compile
+ram: 16384

dts/bindings/serial/xen,hvc-uart.yaml

@@ -0,0 +1,5 @@
+description: Xen Platform HVC UART
+
+compatible: "xen,hvc-uart"
+
+include: uart-controller.yaml

dts/bindings/vendor-prefixes.txt

@@ -665,6 +665,7 @@ wobo	Wobo
 wolfson	Cirrus Logic, Inc. (formerly Wolfson Microelectronics plc)
 worldsemi	Worldsemi Co., Limited
 x-powers	X-Powers
+xen	Xen Hypervisor
 xes	Extreme Engineering Solutions (X-ES)
 xiaomi	Xiaomi Technology Co., Ltd.
 xillybus	Xillybus Ltd.

dts/bindings/xen/xen,xen-4.15.yaml

@@ -0,0 +1,11 @@
+description: Xen Platform Control Registers
+
+compatible: "xen,xen-4.15"
+
+include: base.yaml
+
+properties:
+    reg:
+      required: true
+    interrupts:
+      required: true