ASoC: soc-utils: Export snd_soc_dai_is_dummy() symbol

Export symbol snd_soc_dai_is_dummy() for usage outside core driver
modules. This is required by Tegra ASoC machine driver.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1694098945-32760-2-git-send-email-spujar@nvidia.com


Signed-off-by: Mark Brown <broonie@kernel.org>