ASoC: fsl_audmix: Remove unneeded data field

The .data field is only used to pass the string name to
platform_device_register_data().

Pass the string name directly to make the code simpler.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20201203013439.10617-1-festevam@gmail.com


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