1.add an API of finding the first user task in xiuos task manage list; 2.add restart application after ota

Ubiquitous/XiUOS/kernel/kernel_service/xs_service.c

@@ -120,6 +120,11 @@ uintptr_t KsTaskDelete(uint32_t knum,uintptr_t *param, uint8_t num)
     return  (uintptr_t)ret;
 }
 
+uintptr_t KsUserTaskSerach(uint32_t knum,uintptr_t *param, uint8_t num )
+{
+   return  (uintptr_t)UTaskSearch();
+}
+
 extern void KTaskQuit(void);
 uintptr_t KsTaskQuit(uint32_t knum,uintptr_t *param, uint8_t num )
 {
@@ -567,6 +572,7 @@ struct KernelService g_service_table[256]  __attribute__ ((section (".g_service_
     [KS_USER_TASK_CREATE]          = { KsTaskCreate, 5 },
     [KS_USER_TASK_STARTUP]         = { KsStartupTask, 1 },
     [KS_USER_TASK_DELETE]          = { KsTaskDelete, 1 },
+    [KS_USER_TASK_SEARCH]          = { KsUserTaskSerach, 0 },
 	 [KS_USER_TASK_EXECEXIT]      = { KsTaskQuit, 0 },
     [KS_USER_TASK_CORE_COMBINE]     = { KsTaskCoreCombine, 2 },
     [KS_USER_TASK_CORE_UNCOMBINE]   = { KsTaskCoreUnCombine, 1 },