ASoC: dt-bindings: wlf,wm8962: add missing interrupt property

Both, hardware and drivers does support interrupts.

Fix warnings as:
arch/arm/boot/dts/tegra30-microsoft-surface-rt-efi.dt.yaml: audio-codec@1a: 'interrupt-parent', 'interrupts' do not match any of the regexes: 'pinctrl-[0-9]+'
	From schema: /home/runner/work/linux/linux/Documentation/devicetree/bindings/sound/wlf,wm8962.yaml

Fixes: cd51b942 ("ASoC: dt-bindings: wlf,wm8962: Convert to json-schema")
Signed-off-by: David Heidelberg <david@ixit.cz>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211124155101.59694-1-david@ixit.czSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/wlf,wm8962.yaml

@@ -19,6 +19,9 @@ properties:
   clocks:
     maxItems: 1
 
+  interrupts:
+    maxItems: 1
+
   "#sound-dai-cells":
     const: 0