ASoC: Intel: common: make sst_dma functions static

sst_dma_new and sst_dma_free are not used in any other file and don't
have a prototype. Move to static functions and remove
EXPORT_SYMBOL_GPL statement.

Reported by sparse warnings.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/common/sst-firmware.c

@@ -270,7 +270,7 @@ void sst_dsp_dma_put_channel(struct sst_dsp *dsp)
 }
 EXPORT_SYMBOL_GPL(sst_dsp_dma_put_channel);
 
-int sst_dma_new(struct sst_dsp *sst)
+static int sst_dma_new(struct sst_dsp *sst)
 {
 	struct sst_pdata *sst_pdata = sst->pdata;
 	struct sst_dma *dma;
@@ -320,9 +320,8 @@ int sst_dma_new(struct sst_dsp *sst)
 	devm_kfree(sst->dev, dma);
 	return ret;
 }
-EXPORT_SYMBOL(sst_dma_new);
 
-void sst_dma_free(struct sst_dma *dma)
+static void sst_dma_free(struct sst_dma *dma)
 {
 
 	if (dma == NULL)
@@ -335,7 +334,6 @@ void sst_dma_free(struct sst_dma *dma)
 		dw_remove(dma->chip);
 
 }
-EXPORT_SYMBOL(sst_dma_free);
 
 /* create new generic firmware object */
 struct sst_fw *sst_fw_new(struct sst_dsp *dsp,