dt-bindings: power: Extend nodename pattern for power-domain providers

The existing binding requires the nodename to have a '@', which is a bit
limiting for the wider use case. Therefore, let's extend the pattern to
allow either '@' or '-'.

Fixes: a3f048b5 ("dt: psci: Update DT bindings to support hierarchical PSCI states")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[robh: drop example change]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/power/power-domain.yaml

@@ -25,7 +25,7 @@ description: |+
 
 properties:
   $nodename:
-    pattern: "^(power-controller|power-domain)(@.*)?$"
+    pattern: "^(power-controller|power-domain)([@-].*)?$"
 
   domain-idle-states:
     $ref: /schemas/types.yaml#/definitions/phandle-array