ASoC: codecs: wcd938x: add basic controls

This patch adds basic controls found in wcd938x codec.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210609090943.7896-7-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>