dt-bindings: panel: rocktech,jh057n00900: Modernize

- Use common properties from panel-common.yaml
- Indent comment like content
- Don't preserve newlines in description
- Indent example by four spaces
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/60639e670028af7e8ab31379256ba331a1bdf6cc.1597561897.git.agx@sigxcpu.org

Documentation/devicetree/bindings/display/panel/rocktech,jh057n00900.yaml

@@ -9,7 +9,7 @@ title: Rocktech JH057N00900 5.5" 720x1440 TFT LCD panel
 maintainers:
   - Ondrej Jirman <megi@xff.cz>
 
-description: |
+description:
   Rocktech JH057N00900 is a 720x1440 TFT LCD panel
   connected using a MIPI-DSI video interface.
 
@@ -35,13 +35,9 @@ properties:
   iovcc-supply:
     description: I/O voltage supply
 
-  reset-gpios:
-    description: GPIO used for the reset pin
-    maxItems: 1
+  reset-gpios: true
 
-  backlight:
-    description: Backlight used by the panel
-    $ref: "/schemas/types.yaml#/definitions/phandle"
+  backlight: true
 
 required:
   - compatible
@@ -68,4 +64,5 @@ examples:
             backlight = <&backlight>;
         };
     };
+
 ...