dt-bindings: display: msm: Rename mdss node name in example

Follow other YAMLs and replace mdss name into display-subystem.
Signed-off-by: Adam Skladowski <a39.skl@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Fixes: b93bdff4 ("dt-bindings: display/msm: add support for SM6115")
Fixes: 06097b13 ("dt-bindings: display/msm: split dpu-qcm2290 into DPU and MDSS parts")
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/513585/
Link: https://lore.kernel.org/r/20221130200950.144618-2-a39.skl@gmail.comSigned-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>

Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml

@@ -72,7 +72,7 @@ examples:
     #include <dt-bindings/interconnect/qcom,qcm2290.h>
     #include <dt-bindings/power/qcom-rpmpd.h>
 
-    mdss@5e00000 {
+    display-subsystem@5e00000 {
         #address-cells = <1>;
         #size-cells = <1>;
         compatible = "qcom,qcm2290-mdss";

Documentation/devicetree/bindings/display/msm/qcom,sm6115-mdss.yaml

@@ -62,7 +62,7 @@ examples:
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/power/qcom-rpmpd.h>
 
-    mdss@5e00000 {
+    display-subsystem@5e00000 {
         #address-cells = <1>;
         #size-cells = <1>;
         compatible = "qcom,sm6115-mdss";