migration: expose the bitmap_sync_count to the end

expose the count that logs the times of updating the dirty bitmap to
end user.

Signed-off-by: ChenLiang <chenliang88@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
diff --git a/hmp.c b/hmp.c
index ca869ba..69a70e4 100644
--- a/hmp.c
+++ b/hmp.c
@@ -188,6 +188,8 @@
                        info->ram->normal);
         monitor_printf(mon, "normal bytes: %" PRIu64 " kbytes\n",
                        info->ram->normal_bytes >> 10);
+        monitor_printf(mon, "dirty sync count: %" PRIu64 "\n",
+                       info->ram->dirty_sync_count);
         if (info->ram->dirty_pages_rate) {
             monitor_printf(mon, "dirty pages rate: %" PRIu64 " pages\n",
                            info->ram->dirty_pages_rate);