dt-bindings: display: panel: samsung,atna56ac03: Document ATNA56AC03

The Samsung ATNA56AC03 panel is an AMOLED eDP panel.
It is similar to the ATNA33xc20 except it is larger and has a different
resolution.

Signed-off-by: Maud Spierings <maud_spierings@hotmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241124-asus_qcom_display-v3-1-002b723b1920@hotmail.com

Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml

@@ -23,6 +23,8 @@ properties:
               - samsung,atna45af01
               # Samsung 14.5" 3K (2944x1840 pixels) eDP AMOLED panel
               - samsung,atna45dc02
+              # Samsung 15.6" 3K (2880x1620 pixels) eDP AMOLED panel
+              - samsung,atna56ac03
           - const: samsung,atna33xc20
 
   enable-gpios: true