regulator: dt-bindings: pca9450: Make interrupt optional

The interrupt is optional in hardware and not connected on
some boards. Make it optional in the binding.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://patch.msgid.link/20240708084107.38986-3-frieder@fris.deSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml

@@ -96,7 +96,6 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
   - regulators
 
 additionalProperties: false