[PATCH] missing include in hisax

Missing include, breaks at least on arm.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/isdn/hisax/hfc4s8s_l1.c

@@ -29,6 +29,7 @@
 #include <linux/timer.h>
 #include <linux/skbuff.h>
 #include <linux/wait.h>
+#include <asm/io.h>
 #include "hisax_if.h"
 #include "hfc4s8s_l1.h"