ASoC: atmel: atmel-pcm-dma.c: use devm_snd_dmaengine_pcm_register()

We have devm_xxx version of snd_dmaengine_pcm_register,
let's use it.

This patch also removes related empty functions

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/atmel/atmel-pcm.h

@@ -72,28 +72,20 @@ struct atmel_pcm_dma_params {
 
 #if IS_ENABLED(CONFIG_SND_ATMEL_SOC_PDC)
 int atmel_pcm_pdc_platform_register(struct device *dev);
-void atmel_pcm_pdc_platform_unregister(struct device *dev);
 #else
 static inline int atmel_pcm_pdc_platform_register(struct device *dev)
 {
 	return 0;
 }
-static inline void atmel_pcm_pdc_platform_unregister(struct device *dev)
-{
-}
 #endif
 
 #if IS_ENABLED(CONFIG_SND_ATMEL_SOC_DMA)
 int atmel_pcm_dma_platform_register(struct device *dev);
-void atmel_pcm_dma_platform_unregister(struct device *dev);
 #else
 static inline int atmel_pcm_dma_platform_register(struct device *dev)
 {
 	return 0;
 }
-static inline void atmel_pcm_dma_platform_unregister(struct device *dev)
-{
-}
 #endif
 
 #endif /* _ATMEL_PCM_H */