dt-bindings: display: Convert tfc,s9700rtwv43tr-01b panel to DT schema

Convert the tfc,s9700rtwv43tr-01b panel binding to DT schema.

Cc: Heiko Stuebner <heiko.stuebner@bq.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>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190705164221.4462-9-robh@kernel.org

Documentation/devicetree/bindings/display/panel/tfc,s9700rtwv43tr-01b.txt

-TFC S9700RTWV43TR-01B 7" Three Five Corp 800x480 LCD panel with
-resistive touch
-
-The panel is found on TI AM335x-evm.
-
-Required properties:
-- compatible: should be "tfc,s9700rtwv43tr-01b"
-- power-supply: See panel-common.txt
-
-Optional properties:
-- enable-gpios: GPIO pin to enable or disable the panel, if there is one
-- backlight: phandle of the backlight device attached to the panel
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.

Documentation/devicetree/bindings/display/panel/tfc,s9700rtwv43tr-01b.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/tfc,s9700rtwv43tr-01b.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TFC S9700RTWV43TR-01B 7" Three Five Corp 800x480 LCD panel with resistive touch
+
+maintainers:
+  - Jyri Sarha <jsarha@ti.com>
+  - Thierry Reding <thierry.reding@gmail.com>
+
+description: |+
+  The panel is found on TI AM335x-evm.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: tfc,s9700rtwv43tr-01b
+
+  enable-gpios: true
+  backlight: true
+  port: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - power-supply
+
+...