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/es1938.c b/sound/pci/es1938.c
index a01454b..e1858d9 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -55,6 +55,7 @@
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
+#include <linux/io.h>
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/pcm.h>
@@ -63,8 +64,6 @@
 #include <sound/initval.h>
 #include <sound/tlv.h>
 
-#include <asm/io.h>
-
 MODULE_AUTHOR("Jaromir Koutek <miri@punknet.cz>");
 MODULE_DESCRIPTION("ESS Solo-1");
 MODULE_LICENSE("GPL");