fsl: csu: add an API to set individual device access permission

Add this API to make the individual device is able to be set to
the specified permission.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/include/fsl_csu.h b/include/fsl_csu.h
index f4d97fb..57a9985 100644
--- a/include/fsl_csu.h
+++ b/include/fsl_csu.h
@@ -30,5 +30,6 @@
 };
 
 void enable_layerscape_ns_access(void);
+void set_devices_ns_access(struct csu_ns_dev *ns_dev, u16 val);
 
 #endif