DM: to avoid RTVM shutdown forcely by acrn-dm

if RTVM, now we assume it can't be shutdown forcely by SOS, so
add check condition to avoid that.

Tracked-On: #3564
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>

Author: mgcao

devicemodel/core/monitor.c

@@ -352,7 +352,7 @@ static void handle_stop(struct mngr_msg *msg, int client_fd, void *param)
 	ack.msgid = msg->msgid;
 	ack.timestamp = msg->timestamp;
 
-	if (msg->data.acrnd_stop.force) {
+	if (msg->data.acrnd_stop.force && !is_rtvm) {
 		vm_set_suspend_mode(VM_SUSPEND_POWEROFF);
 		ack.data.err = 0;
 	} else {