dt-bindings: arm: Add arm,static-trace-id for coresight dummy source

Some dummy source HW has static trace id which cannot be changed via
software programming. Add arm,static-trace-id for static id support to
coresight dummy source.

Signed-off-by: Mao Jinlong <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: Mike Leach <[e-mail]>
Signed-off-by: Suzuki K Poulose <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/arm/arm,coresight-dummy-source.yaml

···
     enum:
       - arm,coresight-dummy-source
 
+  arm,static-trace-id:
+    description: If dummy source needs static id support, use this to set trace id.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 111
+
   out-ports:
     $ref: /schemas/graph.yaml#/properties/ports