ASoC: dt-bindings: realtek,rt5645: Fix CPVDD voltage comment

Both the ALC5645 and ALC5650 datasheets specify a recommended voltage of
1.8V for CPVDD, not 3.5V.

Fix the comment.

Cc: Matthias Brugger <[email protected]>
Fixes: 26aa191 ("ASoC: dt-bindings: rt5645: add suppliers")
Fixes: 83d43ab ("ASoC: dt-bindings: realtek,rt5645: Convert to dtschema")
Signed-off-by: Chen-Yu Tsai <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: wens

Documentation/devicetree/bindings/sound/realtek,rt5645.yaml

@@ -51,7 +51,7 @@ properties:
     description: Power supply for AVDD, providing 1.8V.
 
   cpvdd-supply:
-    description: Power supply for CPVDD, providing 3.5V.
+    description: Power supply for CPVDD, providing 1.8V.
 
   hp-detect-gpios:
     description: