dt-bindings: display/msm: another fix for the dpu-qcm2290 example

Make dpu-qcm2290 example really follow the defined schema:
- Drop qcom,mdss compatible. It's only used for MDP5 devices.
- Change display controller name to display-controller as specified in
  the yaml

Reported-by: Rob Herring <robh@kernel.org>
Cc: Loic Poulain <loic.poulain@linaro.org>
Fixes: 164f69d9d4 ("dt-bindings: msm: disp: add yaml schemas for QCM2290 DPU bindings")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20220324115536.2090818-1-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>

Documentation/devicetree/bindings/display/msm/dpu-qcm2290.yaml

@@ -160,7 +160,7 @@ examples:
     mdss: mdss@5e00000 {
         #address-cells = <1>;
         #size-cells = <1>;
-        compatible = "qcom,qcm2290-mdss", "qcom,mdss";
+        compatible = "qcom,qcm2290-mdss";
         reg = <0x05e00000 0x1000>;
         reg-names = "mdss";
         power-domains = <&dispcc MDSS_GDSC>;
@@ -180,7 +180,7 @@ examples:
                  <&apps_smmu 0x421 0x0>;
         ranges;
 
-        mdss_mdp: mdp@5e01000 {
+        mdss_mdp: display-controller@5e01000 {
                 compatible = "qcom,qcm2290-dpu";
                 reg = <0x05e01000 0x8f000>,
                       <0x05eb0000 0x2008>;