ASoC: soc-devres: Remove unused devm_snd_soc_register_dai

The last use of devm_snd_soc_register_dai() was removed by
commit fc4cb1e1 ("ASoC: topology: Properly unregister DAI on removal")
in 2021.

Remove it, and the helper it used.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20241028021226.477909-1-linux@treblig.org


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