dt-bindings: fsl: fsl,rcpm: fix unevaluated fsl,rcpm-wakeup property

Drop the RCPM consumer example from the binding (LPUART device node),
because:
1. Using phandles is typical syntax, thus explaining it is not needed in
   the provider binding,
2. It has 'fsl,rcpm-wakeup' property which is not allowed by LPUART
   binding so it causes dt_binding_check warning:

   fsl,rcpm.example.dtb: serial@2950000: Unevaluated properties are not allowed ('fsl,rcpm-wakeup' was unexpected)
     from schema $id: http://devicetree.org/schemas/serial/fsl-lpuart.yaml#

Alternatively, this property could be added to LPUART binding
(fsl-lpuart.yaml), but it looks like none of in-tree DTS use it.

Fixes: ad21e3840a ("dt-bindings: soc: fsl: Convert rcpm to yaml format")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240811153507.126512-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/soc/fsl/fsl,rcpm.yaml

@@ -80,17 +80,8 @@ additionalProperties: false
 examples:
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
-    rcpm: global-utilities@e2000 {
+    global-utilities@e2000 {
           compatible = "fsl,t4240-rcpm", "fsl,qoriq-rcpm-2.0";
           reg = <0xe2000 0x1000>;
           #fsl,rcpm-wakeup-cells = <2>;
     };
-
-    serial@2950000 {
-         compatible = "fsl,ls1021a-lpuart";
-         reg = <0x2950000 0x1000>;
-         interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
-         clocks = <&sysclk>;
-         clock-names = "ipg";
-         fsl,rcpm-wakeup = <&rcpm 0x0 0x40000000>;
-    };