ASoC: wcd938x: Add support for wcd938x codec variants

Add support for wcd938x codec variants. Changes detect the
variant and enable the corresponding features supported by
the codec variant.

Change-Id: Ib990465b42b903174391bb87115af47431b862ec
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>