ASoC: codecs: wcd939x: 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>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://msgid.link/r/20240612-asoc-wcd9xxx-wide-cleanups-v1-22-0d15885b2a06@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd939x.h

@@ -903,11 +903,6 @@ enum wcd939x_rx_sdw_channels {
 	WCD939X_HIFI_PCM_R,
 };
 
-enum {
-	WCD939X_SDW_DIR_RX,
-	WCD939X_SDW_DIR_TX,
-};
-
 struct wcd939x_priv;
 struct wcd939x_sdw_priv {
 	struct sdw_slave *sdev;