ASoC: dt-bindings: Add WM8978 Binding

Even though we had the wm8978 driver for some time and a number of
boards using it already, we never had a binding for it. Let's add it
based on what the driver expects and the boards are providing.

Cc: [email protected]
Cc: [email protected]
Cc: Liam Girdwood <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: [email protected]
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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