dt-bindings: display/msm: dsi-controller-main: Add msm8226 compatible

Add the compatible for the DSI found on MSM8226.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Patchwork: https://patchwork.freedesktop.org/patch/540613/
Link: https://lore.kernel.org/r/20230308-msm8226-mdp-v3-2-b6284145d67a@z3ntu.xyzSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml

@@ -15,6 +15,7 @@ properties:
       - items:
           - enum:
               - qcom,apq8064-dsi-ctrl
+              - qcom,msm8226-dsi-ctrl
               - qcom,msm8916-dsi-ctrl
               - qcom,msm8953-dsi-ctrl
               - qcom,msm8974-dsi-ctrl
@@ -256,6 +257,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - qcom,msm8226-dsi-ctrl
               - qcom,msm8974-dsi-ctrl
     then:
       properties: