方案描述：
1、liteos_a调度框架支持EDF调度算法，默认优先调度EDF策略的任务
2、用户态musl_c库适配新增调度算法，同步修改相关接口以支持用户态创建EDF进程与线程

BREAKING CHANGE:
support EDF对外变更描述：
以下接口支持SCHED_DEADLINE调度策略:
pthread_attr_getschedparam
pthread_attr_setschedparam
pthread_getschedparam
pthread_setschedparam
pthread_create
sched_getscheduler
sched_getparam
sched_setparam
sched_setscheduler

Close：#I6T3P3
Signed-off-by: Nzhangdengyu <zhangdengyu2@huawei.com>
Change-Id: Ic9fe6896fcae42ae4ee7fe5dfb8e858a6ed19740

close: #I4RE80
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>

Change-Id: I353fe4aa10e4f03e7cbaca572c8e73289c599c29

close: #I4OX3O
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>

Change-Id: I3ba65509135cee2ae3af82fec923a01e00ffdbe8

Change-Id: Ice1193d1ae7f2e0d12a2a38a306a6399407f5037