regulator: Add missing type for 'regulator-microvolt-offset'

'regulator-microvolt-offset' is missing a type definition. The type should
be 'uint32'.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220719215010.1875363-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/regulator.yaml

@@ -23,6 +23,7 @@ properties:
 
   regulator-microvolt-offset:
     description: Offset applied to voltages to compensate for voltage drops
+    $ref: "/schemas/types.yaml#/definitions/uint32"
 
   regulator-min-microamp:
     description: smallest current consumers may set