ASoC: wcd934x: remove unused headers

Looks like there are some unused headers, remove them.
Seems to be missed while moving to mfd.

Reported-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200306132806.19684-3-srinivas.kandagatla@linaro.org


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