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

Ubiquitous/XiUOS/kernel/include/xs_ktask.h

@@ -159,6 +159,7 @@ int32 KTaskCreate(const char *name,
 void KTaskQuit(void);
 
 #ifdef  SEPARATE_COMPILE
+int UTaskSearch(void);
 int32 UTaskCreate(const char *name,
 							void (*entry)(void *parameter),
 							void       *parameter,

Ubiquitous/XiUOS/kernel/include/xs_service.h

@@ -33,6 +33,7 @@ enum KernelServiceEnum
     KS_USER_TASK_CREATE , 
     KS_USER_TASK_STARTUP , 
     KS_USER_TASK_DELETE,
+    KS_USER_TASK_SEARCH,
     KS_USER_TASK_EXECEXIT,
     KS_USER_TASK_CORE_COMBINE,
     KS_USER_TASK_CORE_UNCOMBINE,