feat(intel): implement timer init divider via CPU frequency for N5X

Get CPU frequency and update the timer init div with it.
The timer is vary based on the CPU frequency instead of hardcoded.

Signed-off-by: Jit Loon Lim <jit.loon.lim@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: Ibfaa47fb7a25176eebf06f4828bf9729d56f12ed
diff --git a/plat/intel/soc/n5x/platform.mk b/plat/intel/soc/n5x/platform.mk
index 4f3da4e..7afeb74 100644
--- a/plat/intel/soc/n5x/platform.mk
+++ b/plat/intel/soc/n5x/platform.mk
@@ -36,6 +36,7 @@
 		lib/cpus/aarch64/cortex_a53.S				\
 		plat/common/plat_psci_common.c				\
 		plat/intel/soc/n5x/bl31_plat_setup.c			\
+		plat/intel/soc/n5x/soc/n5x_clock_manager.c		\
 		plat/intel/soc/common/socfpga_psci.c			\
 		plat/intel/soc/common/socfpga_sip_svc.c			\
 		plat/intel/soc/common/socfpga_sip_svc_v2.c		\