ALSA: use linux/io.h to fix compile warnings

For helping to reduce Greert's regression list...
  src/sound/drivers/mtpav.c: error: implicit declaration of function 'inb'
  src/sound/drivers/mtpav.c: error: implicit declaration of function 'outb'
  ...
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/mtpav.c

@@ -55,14 +55,13 @@
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/ioport.h>
+#include <linux/io.h>
 #include <linux/moduleparam.h>
 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/rawmidi.h>
 #include <linux/delay.h>
 
-#include <asm/io.h>
-
 /*
  *      globals
  */

sound/pcmcia/pdaudiocf/pdaudiocf.h

@@ -22,7 +22,7 @@
 #define __PDAUDIOCF_H
 
 #include <sound/pcm.h>
-#include <asm/io.h>
+#include <linux/io.h>
 #include <linux/interrupt.h>
 #include <pcmcia/cistpl.h>
 #include <pcmcia/ds.h>

sound/pcmcia/vx/vxp_ops.c

@@ -23,8 +23,8 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/firmware.h>
+#include <linux/io.h>
 #include <sound/core.h>
-#include <asm/io.h>
 #include "vxpocket.h"