clk: rockchip: add missing include guards

Review for the rk3368 turned up that the clock header was missing include
guards. This is also true for the already existing clock binding headers,
so add them.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/include/dt-bindings/clock/rk3188-cru-common.h b/include/dt-bindings/clock/rk3188-cru-common.h
index 6a37050..8df77a7 100644
--- a/include/dt-bindings/clock/rk3188-cru-common.h
+++ b/include/dt-bindings/clock/rk3188-cru-common.h
@@ -13,6 +13,9 @@
  * GNU General Public License for more details.
  */
 
+#ifndef _DT_BINDINGS_CLK_ROCKCHIP_RK3188_COMMON_H
+#define _DT_BINDINGS_CLK_ROCKCHIP_RK3188_COMMON_H
+
 /* core clocks from */
 #define PLL_APLL		1
 #define PLL_DPLL		2
@@ -248,3 +251,5 @@
 #define SRST_PTM1_ATB		141
 #define SRST_CTM		142
 #define SRST_TS			143
+
+#endif