staging: lustre: Fix style warning on header

Fix checkpatch.pl warning:
WARNING: Use #include <linux/io.h> instead of <asm/io.h>
Signed-off-by: Miguel Bernabeu Diaz <miguelbernadi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.h

@@ -48,7 +48,7 @@
 #include <linux/uio.h>
 #include <linux/uaccess.h>
 
-#include <asm/io.h>
+#include <linux/io.h>
 
 #include <linux/fs.h>
 #include <linux/file.h>