dt-bindings: panel: sw43408: adjust to reflect the DDIC and panel used

Add compatible for used LG panel.
SW43408 is not panel, but DDIC. The panel itself is the
LG LH546WF1-ED01, so introduce combined compatible for it.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: David Heidelberg <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

Documentation/devicetree/bindings/display/panel/lg,sw43408.yaml

···
 $id: http://devicetree.org/schemas/display/panel/lg,sw43408.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: LG SW43408 1080x2160 DSI panel
+title: LG SW43408 AMOLED DDIC
 
 maintainers:
   - Casey Connolly <[e-mail]>
 
 description:
-  This panel is used on the Pixel 3, it is a 60hz OLED panel which
-  required DSC (Display Stream Compression) and has rounded corners.
+  The SW43408 is display driver IC with connected panel.
+
+  LG LH546WF1-ED01 panel is used on the Pixel 3, it is a 60hz OLED panel
+  which required DSC (Display Stream Compression) and has rounded corners.
 
 allOf:
   - $ref: panel-common.yaml#
···
 properties:
   compatible:
     items:
+      - enum:
+            # LG 5.46 inch, 1080x2160 pixels, 18:9 ratio
+          - lg,sw43408-lh546wf1-ed01
       - const: lg,sw43408
 
   reg:
···
         #size-cells = <0>;
 
         panel@0 {
-            compatible = "lg,sw43408";
+            compatible = "lg,sw43408-lh546wf1-ed01", "lg,sw43408";
             reg = <0>;
 
             vddi-supply = <&vreg_l14a_1p88>;