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/rockchip/common/aarch64/platform_common.c b/plat/rockchip/common/aarch64/platform_common.c
index ba4d1a4..6e9dab7 100644
--- a/plat/rockchip/common/aarch64/platform_common.c
+++ b/plat/rockchip/common/aarch64/platform_common.c
@@ -75,7 +75,7 @@
 /* Define EL3 variants of the function initialising the MMU */
 DEFINE_CONFIGURE_MMU_EL(3)
 
-unsigned long long plat_get_syscnt_freq(void)
+unsigned int plat_get_syscnt_freq2(void)
 {
 	return SYS_COUNTER_FREQ_IN_TICKS;
 }