ASoC: dt-bindings: samsung,tm2: Correct "audio-codec" constraints

The "audio-codec" constraints define how many entries(2), but not the
size of each entry. Each entry is a single phandle. Define the size with
an inner 'items' list.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://msgid.link/r/20240124190754.1554899-1-robh@kernel.org


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>