[ALSA] Remove sound/driver.h

This header file exists only for some hacks to adapt alsa-driver
tree.  It's useless for building in the kernel.  Let's move a few
lines in it to sound/core.h and remove it.
With this patch, sound/driver.h isn't removed but has just a single
compile warning to include it.  This should be really killed in
future.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/include/sound/opl3.h b/include/sound/opl3.h
index d7e33ce..a0c5feb 100644
--- a/include/sound/opl3.h
+++ b/include/sound/opl3.h
@@ -51,19 +51,16 @@
  *
  */
 
-#include "driver.h"
-#include <linux/time.h>
-#include <linux/mutex.h>
-#include "core.h"
-#include "hwdep.h"
-#include "timer.h"
-#include "seq_midi_emul.h"
+#include <sound/core.h>
+#include <sound/hwdep.h>
+#include <sound/timer.h>
+#include <sound/seq_midi_emul.h>
 #ifdef CONFIG_SND_SEQUENCER_OSS
-#include "seq_oss.h"
-#include "seq_oss_legacy.h"
+#include <sound/seq_oss.h>
+#include <sound/seq_oss_legacy.h>
 #endif
-#include "seq_device.h"
-#include "asound_fm.h"
+#include <sound/seq_device.h>
+#include <sound/asound_fm.h>
 
 /*
  *    Register numbers for the global registers