ASoC: soc-dapm.h: fixup warning struct snd_pcm_substream not declared

Add struct snd_pcm_substream forward declaration

Fixes: 078a85f ("ASoC: dapm: Only power up active channels from a DAI")
Signed-off-by: Lucas Tanure <[email protected]>
Reviewed-by: Charles Keepax <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Lucas Tanure

include/sound/soc-dapm.h

@@ -16,6 +16,7 @@
 #include <sound/asoc.h>
 
 struct device;
+struct snd_pcm_substream;
 struct snd_soc_pcm_runtime;
 struct soc_enum;