dt-bindings: display/msm: Document the DPU for X1E80100

Document the DPU for Qualcomm X1E80100 platform in the SM8650 schema, as
they are similar.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/579072/
Link: https://lore.kernel.org/r/20240220-x1e80100-display-v4-1-971afd9de861@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Author: abelvesa

Documentation/devicetree/bindings/display/msm/qcom,sm8650-dpu.yaml

@@ -13,7 +13,9 @@ $ref: /schemas/display/msm/dpu-common.yaml#
 
 properties:
   compatible:
-    const: qcom,sm8650-dpu
+    enum:
+      - qcom,sm8650-dpu
+      - qcom,x1e80100-dpu
 
   reg:
     items: