ASoC: codecs: wcd938x: add playback dapm widgets

This patch adds required dapm widgets for playback.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210609090943.7896-8-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>