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/include/sound/sb.h b/include/sound/sb.h
index 33e2d11..bacefae 100644
--- a/include/sound/sb.h
+++ b/include/sound/sb.h
@@ -25,7 +25,7 @@
 #include <sound/pcm.h>
 #include <sound/rawmidi.h>
 #include <linux/interrupt.h>
-#include <asm/io.h>
+#include <linux/io.h>
 
 enum sb_hw_type {
 	SB_HW_AUTO,