ALSA: Include linux/io.h instead of asm/io.h

Nowadays it's recommended.  Replace all in a shot.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/rme32.c b/sound/pci/rme32.c
index 1a7affa..23d7f5d 100644
--- a/sound/pci/rme32.c
+++ b/sound/pci/rme32.c
@@ -75,6 +75,7 @@
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/io.h>
 
 #include <sound/core.h>
 #include <sound/info.h>
@@ -85,8 +86,6 @@
 #include <sound/asoundef.h>
 #include <sound/initval.h>
 
-#include <asm/io.h>
-
 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */