ASoC: codecs: wcd938x: Drop unused RX/TX direction enum

The enum with RX/TX soundwire direction is not used.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240612-asoc-wcd9xxx-wide-cleanups-v1-18-0d15885b2a06@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x.h

@@ -642,10 +642,6 @@ enum wcd938x_rx_sdw_channels {
 	WCD938X_DSD_R,
 	WCD938X_DSD_L,
 };
-enum {
-	WCD938X_SDW_DIR_RX,
-	WCD938X_SDW_DIR_TX,
-};
 
 struct wcd938x_priv;
 struct wcd938x_sdw_priv {