rockchip: rk3328: add COUNTER_FREQUENCY definition

The arch timer needs COUNTER_FREQUENCY to get correct counter, add it to
make the timer works correct.
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>

include/configs/rk3328_common.h

@@ -11,6 +11,7 @@
 #define CONFIG_IRAM_BASE		0xff090000
 
 #define CONFIG_ROCKCHIP_STIMER_BASE    0xff1d0020
+#define COUNTER_FREQUENCY		24000000
 
 #define CONFIG_SYS_CBSIZE		1024
 #define CONFIG_SKIP_LOWLEVEL_INIT