dt-bindings: sound: sun4i-i2s: add Allwinner V3 I2S compatible

The I2S peripheral of the Allwinner V3 SoC is compatible with the one
found in the Allwinner H3 SoC.
This patch adds a compatible string for it.
Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210514134405.2097464-7-t.schramm@manjaro.org

Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-i2s.yaml

@@ -20,6 +20,9 @@ properties:
       - const: allwinner,sun6i-a31-i2s
       - const: allwinner,sun8i-a83t-i2s
       - const: allwinner,sun8i-h3-i2s
+      - items:
+          - const: allwinner,sun8i-v3-i2s
+          - const: allwinner,sun8i-h3-i2s
       - const: allwinner,sun50i-a64-codec-i2s
       - items:
           - const: allwinner,sun50i-a64-i2s