feat(intel): implement timer init divider via cpu frequency. (#1)

Get cpu frequency and update the timer init div with it.
The timer is vary based on the cpu frequency instead of hardcoded.
The implementation shall apply to only Agilex and S10

Signed-off-by: Jit Loon Lim <jit.loon.lim@intel.com>
Change-Id: I61684d9762ad34e5a60b8b176b60c8848db4b422
diff --git a/plat/intel/soc/stratix10/include/s10_clock_manager.h b/plat/intel/soc/stratix10/include/s10_clock_manager.h
index acc700a..a2e4f37 100644
--- a/plat/intel/soc/stratix10/include/s10_clock_manager.h
+++ b/plat/intel/soc/stratix10/include/s10_clock_manager.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Intel Corporation. All rights reserved.
+ * Copyright (c) 2019-2022, Intel Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -92,5 +92,7 @@
 uint32_t get_wdt_clk(void);
 uint32_t get_uart_clk(void);
 uint32_t get_mmc_clk(void);
+uint32_t get_l3_clk(uint32_t ref_clk);
+uint32_t get_ref_clk(uint32_t pllglob);
 
 #endif