Add tristate prompt to allow codec selection.

Cc: Oder Chiou <oder_chiou@realtek.com>
Cc: Bard Liao <bardliao@realtek.com>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1611944866-29373-5-git-send-email-spujar@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>