headers/deps: sound: Optimize <sound/core.h> dependencies, remove <linux/sched.h> inclusion

          --------------------------------------------------------------------
          | Combined, preprocessed C code size of header, without line markers,
          | with comments stripped:
          -------------------------
  before: | #include <sound/core.h>                 | LOC:  5,565 | headers:  165
   after: | #include <sound/core.h>                 | LOC:  5,056 | headers:  144

Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/include/sound/core.h b/include/sound/core.h
index 4f8b534..cbae88b 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -15,7 +15,6 @@
 #include <linux/pm.h>			/* pm_message_t */
 #include <linux/stringify.h>
 #include <linux/printk.h>
-#include <linux/sched.h>
 #include <linux/wait_types.h>
 
 /* number of supported soundcards */