ASoC: SOF: Intel: add module namespace for legacy IPC

The legacy IPC routines are only used by broadwell and baytrail
modules, import them as needed and make sure other modules cannot load
them.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191217202231.18259-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/bdw.c

@@ -642,3 +642,4 @@ const struct sof_intel_dsp_desc bdw_chip_info = {
 EXPORT_SYMBOL(bdw_chip_info);
 
 MODULE_LICENSE("Dual BSD/GPL");
+MODULE_IMPORT_NS(SND_SOC_SOF_INTEL_HIFI_EP_IPC);

sound/soc/sof/intel/byt.c

@@ -877,3 +877,4 @@ EXPORT_SYMBOL(cht_chip_info);
 #endif /* CONFIG_SND_SOC_SOF_BAYTRAIL */
 
 MODULE_LICENSE("Dual BSD/GPL");
+MODULE_IMPORT_NS(SND_SOC_SOF_INTEL_HIFI_EP_IPC);

sound/soc/sof/intel/intel-ipc.c

@@ -39,7 +39,7 @@ void intel_ipc_msg_data(struct snd_sof_dev *sdev,
 			sof_mailbox_read(sdev, stream->posn_offset, p, sz);
 	}
 }
-EXPORT_SYMBOL(intel_ipc_msg_data);
+EXPORT_SYMBOL_NS(intel_ipc_msg_data, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
 
 int intel_ipc_pcm_params(struct snd_sof_dev *sdev,
 			 struct snd_pcm_substream *substream,
@@ -60,7 +60,7 @@ int intel_ipc_pcm_params(struct snd_sof_dev *sdev,
 
 	return 0;
 }
-EXPORT_SYMBOL(intel_ipc_pcm_params);
+EXPORT_SYMBOL_NS(intel_ipc_pcm_params, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
 
 int intel_pcm_open(struct snd_sof_dev *sdev,
 		   struct snd_pcm_substream *substream)
@@ -75,7 +75,7 @@ int intel_pcm_open(struct snd_sof_dev *sdev,
 
 	return 0;
 }
-EXPORT_SYMBOL(intel_pcm_open);
+EXPORT_SYMBOL_NS(intel_pcm_open, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
 
 int intel_pcm_close(struct snd_sof_dev *sdev,
 		    struct snd_pcm_substream *substream)
@@ -87,6 +87,6 @@ int intel_pcm_close(struct snd_sof_dev *sdev,
 
 	return 0;
 }
-EXPORT_SYMBOL(intel_pcm_close);
+EXPORT_SYMBOL_NS(intel_pcm_close, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
 
 MODULE_LICENSE("Dual BSD/GPL");