dt-bindings: sound: sun4i-i2s: add Allwinner R40 I2S compatible

Allwinner R40 has 3 I2S controllers, compatible to those, found in H3.

Add R40/H3 compatible pair to DT bindings.
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210912072914.398419-2-jernej.skrabec@gmail.com

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-r40-i2s
+          - const: allwinner,sun8i-h3-i2s
       - items:
           - const: allwinner,sun8i-v3-i2s
           - const: allwinner,sun8i-h3-i2s