ASoC: dt-bindings: Centralize the 'sound-dai' definition

'sound-dai' is a common property, but has duplicate type definitions.
Create a new common definition to define the type and then update all
the other occurrences to just define how many entries there are just
like other phandle+arg properties.

The constraints on the number of entries is based on the examples and
could be wrong.

Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220126231427.1638089-1-robh@kernel.org