fix: tick timer时钟频率赋值修改为运行时赋值

OS_SYS_CLOCK 宏由产品定义，该宏可能为函数，在编译时赋值无法覆盖该场景

Close #I4PGUR
Signed-off-by: zhushengle <zhushengle@huawei.com>
Change-Id: I60e3f4fcd8f94b26c23cc88e0622408a24fbebe2

arch/csky/v2/gcc/los_timer.c

@@ -61,7 +61,7 @@ STATIC VOID SysTickLock(VOID);
 STATIC VOID SysTickUnlock(VOID);
 
 STATIC ArchTickTimer g_archTickTimer = {
-    .freq = OS_SYS_CLOCK,
+    .freq = 0,
     .irqNum = TIM_INT_NUM,
     .init = SysTickStart,
     .getCycle = SysTickCycleGet,
@@ -82,6 +82,8 @@ STATIC UINT32 SysTickStart(HWI_PROC_FUNC handler)
 {
     ArchTickTimer *tick = &g_archTickTimer;
 
+    tick->freq = OS_SYS_CLOCK;
+
     SysTick->LOAD = (OS_CYCLE_PER_TICK - 1);
     SysTick->VAL = 0;
     SysTick->CTRL |= (CORETIM_SOURCE | CORETIM_ENABLE | CORETIM_INTMASK);