dt-bindings: display: Convert armadeus,st0700-adapt panel to DT schema

Convert the armadeus,st0700-adapt panel binding to DT schema.

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>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190705164221.4462-4-robh@kernel.org

Documentation/devicetree/bindings/display/panel/armadeus,st0700-adapt.txt

-Armadeus ST0700 Adapt. A Santek ST0700I5Y-RBSLW 7.0" WVGA (800x480) TFT with
-an adapter board.
-
-Required properties:
-- compatible: "armadeus,st0700-adapt"
-- power-supply: see panel-common.txt
-
-Optional properties:
-- backlight: see panel-common.txt

Documentation/devicetree/bindings/display/panel/armadeus,st0700-adapt.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/armadeus,st0700-adapt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Armadeus ST0700 Adapter
+
+description:
+  A Santek ST0700I5Y-RBSLW 7.0" WVGA (800x480) TFT with an adapter board.
+
+maintainers:
+  - '"Sébastien Szymanski" <sebastien.szymanski@armadeus.com>'
+  - Thierry Reding <thierry.reding@gmail.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: armadeus,st0700-adapt
+
+  power-supply: true
+  backlight: true
+  port: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - power-supply
+
+...