dt-bindings: usb: mtk-xhci: Allow wakeup interrupt-names to be optional

Add missing "minItems: 1" to the interrupt-names property to allow the
second interrupt-names, "wakeup", to be optional.

Fixes: fe8e4880 ("dt-bindings: usb: mtk-xhci: add wakeup interrupt")
Signed-off-by: NNícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: NChunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220623193702.817996-2-nfraprado@collabora.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml

@@ -57,6 +57,7 @@ properties:
       - description: optional, wakeup interrupt used to support runtime PM
 
   interrupt-names:
+    minItems: 1
     items:
       - const: host
       - const: wakeup