dt-bindings: display: seiko,43wvf1g: Add the 'enable-gpios' property

Add an optional 'enable-gpios' property that can be used to turn on/off
the display.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230314111724.1520178-1-festevam@denx.de

Documentation/devicetree/bindings/display/panel/seiko,43wvf1g.yaml

@@ -25,6 +25,8 @@ properties:
   avdd-supply:
     description: 5v analog regulator
 
+  enable-gpios: true
+
 required:
   - compatible
   - dvdd-supply