fixed ea12d40 from https://gitee.com/zhushengle/kernel_liteos_m/pulls/456

fix: tick中断处理时，无挂起任务时应更新当前运行任务的时间片, 并触发一次调度

Close #I4LRZG

Signed-off-by: zhushengle <zhushengle@huawei.com>
Change-Id: I4472fb50c775b832688aa7a555498901a80e2999