[S390] blacklist.c: removed duplicated include

Removed duplicated include <asm/cio.h>
in drivers/s390/cio/blacklist.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/blacklist.c

@@ -19,7 +19,6 @@
 
 #include <asm/cio.h>
 #include <asm/uaccess.h>
-#include <asm/cio.h>
 
 #include "blacklist.h"
 #include "cio.h"