dt-bindings: Reference opp-v1 schema in CPU schemas

The opp-v1 binding is only used in MIPS and arm32 CPU nodes, so add a
$ref to it in the CPU schemas and drop the "select".

As opp-v1 has long been deprecated, mark it as such.

Acked-by: Viresh Kumar <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Sudeep Holla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/arm/cpus.yaml

···
       physical start address it should jump to.
 
 allOf:
+  - $ref: /schemas/opp/opp-v1.yaml#
   - if:
       # If the enable-method property contains one of those values
       properties:

Documentation/devicetree/bindings/mips/cpus.yaml

···
   device_type: true
 
 allOf:
+  - $ref: /schemas/opp/opp-v1.yaml#
   - if:
       properties:
         compatible:
···
   - compatible
   - reg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |

Documentation/devicetree/bindings/opp/opp-v1.yaml

···
 
   This binding only supports voltage-frequency pairs.
 
-select: true
+deprecated: true
 
 properties:
   operating-points: