ASoC: Intel: ssp-common: Add stub for sof_ssp_get_codec_name

As this function is now used in sof_board_helpers it requires a build
stub for the case SSP_COMMON is not built in.

Fixes: ba0c7c32 ("ASoC: Intel: board_helpers: support amp link initialization")
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20240208165545.93811-21-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_ssp_common.h

@@ -67,6 +67,14 @@ enum sof_ssp_codec {
 
 enum sof_ssp_codec sof_ssp_detect_codec_type(struct device *dev);
 enum sof_ssp_codec sof_ssp_detect_amp_type(struct device *dev);
+
+#if IS_ENABLED(CONFIG_SND_SOC_INTEL_SOF_SSP_COMMON)
 const char *sof_ssp_get_codec_name(enum sof_ssp_codec codec_type);
+#else
+static inline const char *sof_ssp_get_codec_name(enum sof_ssp_codec codec_type)
+{
+	return NULL;
+}
+#endif
 
 #endif /* __SOF_SSP_COMMON_H */