fixed 2b1e5a7a from https://gitee.com/zhushengle/kernel_liteos_m/pulls/308

fix: 修复pthread_create行为与posix不一致问题

1.提升posix接口和LOS接口的兼容性
2.支持优先级继承属性

Close #I49W9F
Signed-off-by: zhushengle <zhushengle@huawei.com>
Change-Id: I4d9df778a559f094dd3062e5e7030e3a03c884ec