dt-bindings: display: panel: ronbo,rb070d30: panel-common ref

Add missing ref on panel-common.yaml for this dsi panel so that common
properties can be shared.

Drop reset-gpios and backlight as they are already in panel-common.

Switch from additionalProperties to unevaluatedProperties so that common
panel properties are available without repeating them in this binding.

Notably panel-common defines the "port" property for linking panels to a
source - which was missing from this panel. Mark it as required.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251117-imx8mp-hb-iiot-v3-2-bf1a4cf5fa8e@solid-run.com

Documentation/devicetree/bindings/display/panel/ronbo,rb070d30.yaml

@@ -9,6 +9,9 @@ title: Ronbo RB070D30 DSI Display Panel
 maintainers:
   - Maxime Ripard <mripard@kernel.org>
 
+allOf:
+  - $ref: panel-common.yaml#
+
 properties:
   compatible:
     const: ronbo,rb070d30
@@ -20,10 +23,6 @@ properties:
     description: GPIO used for the power pin
     maxItems: 1
 
-  reset-gpios:
-    description: GPIO used for the reset pin
-    maxItems: 1
-
   shlr-gpios:
     description: GPIO used for the shlr pin (horizontal flip)
     maxItems: 1
@@ -35,10 +34,6 @@ properties:
   vcc-lcd-supply:
     description: Power regulator
 
-  backlight:
-    description: Backlight used by the panel
-    $ref: /schemas/types.yaml#/definitions/phandle
-
 required:
   - compatible
   - power-gpios
@@ -47,5 +42,6 @@ required:
   - shlr-gpios
   - updn-gpios
   - vcc-lcd-supply
+  - port
 
-additionalProperties: false
+unevaluatedProperties: false