rcar_gen3: drivers: Change to restore timer counter value at resume

Changed to save and restore cntpct_el0 using memory mapped
register for generic timer when System Suspend and Resume.

Reported by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: I40fd9f5434c4d52b320cd1d20322b9b8e4e67155
diff --git a/drivers/renesas/rcar/pwrc/pwrc.h b/drivers/renesas/rcar/pwrc/pwrc.h
index d4d6fc4..cfb35ff 100644
--- a/drivers/renesas/rcar/pwrc/pwrc.h
+++ b/drivers/renesas/rcar/pwrc/pwrc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, Renesas Electronics Corporation. All rights reserved.
+ * Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -52,6 +52,7 @@
 uint32_t rcar_pwrc_get_cluster(void);
 uint32_t rcar_pwrc_get_mpidr_cluster(uint64_t mpidr);
 uint32_t rcar_pwrc_get_cpu_num(uint32_t cluster_type);
+void rcar_pwrc_restore_timer_state(void);
 void plat_secondary_reset(void);
 
 void rcar_pwrc_code_copy_to_system_ram(void);
@@ -67,12 +68,8 @@
 void rcar_pwrc_suspend_to_ram(void);
 #endif
 
-extern void rcar_pwrc_save_generic_timer(uint64_t *rcar_stack_generic_timer);
 extern uint32_t rcar_pwrc_switch_stack(uintptr_t jump, uintptr_t stack,
 				       void *arg);
-
-extern uint64_t rcar_stack_generic_timer[5];
-
 #endif
 
 #endif /* PWRC_H */