ASoC: meson: t9015: Add missing AVDD-supply property

Fixes the schema check warning "audio-controller@32000: 'AVDD-supply'
do not match any of the regexes: 'pinctrl-[0-9]+'"

Fixes: 5c36abc ("ASoC: meson: add t9015 internal codec binding documentation")
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Alexander Stein <alexander.stein@mailbox.org>
Link: https://lore.kernel.org/r/20211026182754.900688-1-alexander.stein@mailbox.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/amlogic,t9015.yaml

@@ -34,13 +34,18 @@ properties:
   resets:
     maxItems: 1
 
+  AVDD-supply:
+    description:
+      Analogue power supply.
+
 required:
   - "#sound-dai-cells"
   - compatible
   - reg
   - clocks
   - clock-names
   - resets
+  - AVDD-supply
 
 additionalProperties: false
 
@@ -56,4 +61,5 @@ examples:
         clocks = <&clkc CLKID_AUDIO_CODEC>;
         clock-names = "pclk";
         resets = <&reset RESET_AUDIO_CODEC>;
+        AVDD-supply = <&vddao_1v8>;
     };