[S390] avoid default_llseek in s390 drivers

Use nonseekable_open for a couple of s390 device drivers. This avoids
the use of default_llseek function which has a dependency on the BKL.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 0168472..9819226 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -655,6 +655,7 @@
 	p_info->act_entry_offset = 0;
 	file->private_data = p_info;
 	debug_info_get(debug_info);
+	nonseekable_open(inode, file);
 out:
 	mutex_unlock(&debug_mutex);
 	return rc;