Implement plat_get_syscnt_freq2 on platforms

Replaced plat_get_syscnt_freq by plat_get_syscnt_freq2 on all
upstream platforms.

Change-Id: I3248f3f65a16dc5e9720012a05c35b9e3ba6abbe
diff --git a/plat/nvidia/tegra/soc/t210/plat_setup.c b/plat/nvidia/tegra/soc/t210/plat_setup.c
index eecedb3..70a55c6 100644
--- a/plat/nvidia/tegra/soc/t210/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t210/plat_setup.c
@@ -80,7 +80,7 @@
 /*******************************************************************************
  * Handler to get the System Counter Frequency
  ******************************************************************************/
-unsigned long long plat_get_syscnt_freq(void)
+unsigned int plat_get_syscnt_freq2(void)
 {
 	return 19200000;
 }