regulator: Constify the pointer to alias name array

Toughen-up checks for read-only regulator names.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index bdba8c6..f543de9 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -63,7 +63,7 @@
 	/* A list of regulator supplies that should be mapped to the MFD
 	 * device rather than the child device when requested
 	 */
-	const char		**parent_supplies;
+	const char * const	*parent_supplies;
 	int			num_parent_supplies;
 };