OPP: Staticize `lazy_opp_tables` in of.c

`lazy_opp_tables` is only used in of.c, move it there and mark it
`static`.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/opp/core.c

@@ -29,9 +29,6 @@
  */
 LIST_HEAD(opp_tables);
 
-/* OPP tables with uninitialized required OPPs */
-LIST_HEAD(lazy_opp_tables);
-
 /* Lock to allow exclusive modification to the device and opp lists */
 DEFINE_MUTEX(opp_table_lock);
 /* Flag indicating that opp_tables list is being updated at the moment */

drivers/opp/of.c

@@ -21,6 +21,9 @@
 
 #include "opp.h"
 
+/* OPP tables with uninitialized required OPPs */
+static LIST_HEAD(lazy_opp_tables);
+
 /*
  * Returns opp descriptor node for a device node, caller must
  * do of_node_put().

drivers/opp/opp.h

@@ -26,7 +26,7 @@ struct regulator;
 /* Lock to allow exclusive modification to the device and opp lists */
 extern struct mutex opp_table_lock;
 
-extern struct list_head opp_tables, lazy_opp_tables;
+extern struct list_head opp_tables;
 
 /* OPP Config flags */
 #define OPP_CONFIG_CLK			BIT(0)