dt-bindings: display: Convert ampire,am-480272h3tmqw-t01h panel to DT schema

Convert the ampire,am-480272h3tmqw-t01h panel binding to DT schema.

Cc: Yannick Fertre <yannick.fertre@st.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190705164221.4462-3-robh@kernel.org

Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt

-Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.
-
-Required properties:
-- compatible: should be "ampire,am-480272h3tmqw-t01h"
-
-Optional properties:
-- power-supply: regulator to provide the supply voltage
-- enable-gpios: GPIO pin to enable or disable the panel
-- backlight: phandle of the backlight device attached to the panel
-
-Optional nodes:
-- Video port for RGB input.
-
-Example:
-	panel_rgb: panel-rgb {
-		compatible = "ampire,am-480272h3tmqw-t01h";
-		enable-gpios = <&gpioa 8 1>;
-		port {
-			panel_in_rgb: endpoint {
-				remote-endpoint = <&controller_out_rgb>;
-			};
-		};
-	};

Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/ampire,am-480272h3tmqw-t01h.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
+
+maintainers:
+  - Yannick Fertre <yannick.fertre@st.com>
+  - Thierry Reding <treding@nvidia.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: ampire,am-480272h3tmqw-t01h
+
+  power-supply: true
+  enable-gpios: true
+  backlight: true
+  port: true
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    panel_rgb: panel {
+      compatible = "ampire,am-480272h3tmqw-t01h";
+      enable-gpios = <&gpioa 8 1>;
+      port {
+        panel_in_rgb: endpoint {
+          remote-endpoint = <&controller_out_rgb>;
+        };
+      };
+    };
+
+...