plat/rockchip: enable power domains of rk3399 before reset

This patch fixes hangs that happen after soft resetting of rk3399.

Signed-off-by: Piotr Szczepanik <piter75@gmail.com>
Change-Id: If41b12ba1dfcb2ba937361b58eafd50bf5c483d4
diff --git a/plat/rockchip/rk3399/drivers/pmu/pmu.h b/plat/rockchip/rk3399/drivers/pmu/pmu.h
index 74db82f..bb7de50 100644
--- a/plat/rockchip/rk3399/drivers/pmu/pmu.h
+++ b/plat/rockchip/rk3399/drivers/pmu/pmu.h
@@ -136,5 +136,6 @@
 extern uint32_t clst_warmboot_data[PLATFORM_CLUSTER_COUNT];
 
 extern void sram_func_set_ddrctl_pll(uint32_t pll_src);
+void pmu_power_domains_on(void);
 
 #endif /* PMU_H */