MLKU-24-8 sound:asoc: change soc_enum array to single enums

It is error prone to use soc_enum array for controls because introducing
new controls must always be done at the end of array or it will add
offset to existing controls.

Signed-off-by: Cosmin-Gabriel Samoila <cosmin.samoila@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
(cherry picked from commit 08004f69)