dt-bindings: bus: fsl,imx8qxp-pixel-link-msi-bus: Drop child 'reg' property

A bus schema based on simple-pm-bus shouldn't define how many 'reg' entries
a child device has. That is a property of the device. Drop the 'reg' entry.
Reviewed-by: Liu Ying <victor.liu@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230925212639.1975002-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml

@@ -73,9 +73,6 @@ patternProperties:
   "^.*@[0-9a-f]+$":
     description: Devices attached to the bus
     type: object
-    properties:
-      reg:
-        maxItems: 1
 
     required:
       - reg