dt-bindings: mfd: ti,j721e-system-controller: Remove syscon from example

The binding for ti,am654-ehrpwm-tbclk was updated to remove the syscon
compatible hint. Remove the same from the example in this binding.
Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20230623201519.194269-1-afd@ti.comAcked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml

@@ -101,7 +101,7 @@ examples:
         };
 
         clock-controller@4140 {
-            compatible = "ti,am654-ehrpwm-tbclk", "syscon";
+            compatible = "ti,am654-ehrpwm-tbclk";
             reg = <0x4140 0x18>;
             #clock-cells = <1>;
         };