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

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