clk: rockchip: add clock id for watchdog pclk on rk3328

Needed to export that added clock.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

include/dt-bindings/clock/rk3328-cru.h

@@ -173,6 +173,7 @@
 #define PCLK_DCF		233
 #define PCLK_SARADC		234
 #define PCLK_ACODECPHY		235
+#define PCLK_WDT		236
 
 /* hclk gates */
 #define HCLK_PERI		308