include/uapi/sound/emu10k1.h: include sound/asound.h

Fixes userspace compilation errors like:
error: field ‘id’ has incomplete type
struct snd_ctl_elem_id id;  /* full control ID definition */

Signed-off-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/uapi/sound/emu10k1.h

@@ -23,8 +23,7 @@
 #define _UAPI__SOUND_EMU10K1_H
 
 #include <linux/types.h>
-
-
+#include <sound/asound.h>
 
 /*
  * ---- FX8010 ----