sched/dumpstack: raise the stack dump level to emergency

since sometimes dumpstack will be used in extreme situations(eg. assert)

Signed-off-by: chao.an <anchao@xiaomi.com>

libs/libc/sched/sched_dumpstack.c

@@ -69,8 +69,7 @@ void sched_dumpstack(pid_t tid)
                       DUMP_FORMAT, DUMP_WIDTH, address[i]);
       if (i == size - 1 || ret % DUMP_LINESIZE == 0)
         {
-          syslog(LOG_INFO, "[BackTrace|%2d|%d]: %s\n",
-                           tid, i / DUMP_NITEM, line);
+          syslog(LOG_EMERG, "backtrace|%2d: %s\n", tid, line);
           ret = 0;
         }
     }