watch dueros, restart if pid_num less than 2

Change-Id: I48b8097908908dbc5ae2e784d960527cb3e4c95d
Signed-off-by: hertz.wang <wangh@rock-chips.com>

rk3308/dueros/watch_dueros_service.sh

@@ -4,7 +4,7 @@ sleep 5
 
 while true;do
     pid_num=`pidof duer_linux alsa_audio_main_service | wc -w`
-    if [ $pid_num -ne 2 ] ;then
+    if [ $pid_num -lt 2 ] ;then
         echo "duer_linux|alsa_audio_main_service died, restart it."
         /oem/dueros_service.sh restart
     fi