libqdutils: move refreshScreen API out of namespace

refreshScreen API must be out of qdutils namespace to be used
by modules to dynamically load and use this API.

Change-Id: I9a15f5f26a2a4e95c3782a38857dd2043c71081e
diff --git a/libqdutils/display_config.cpp b/libqdutils/display_config.cpp
index a4381df..3941137 100644
--- a/libqdutils/display_config.cpp
+++ b/libqdutils/display_config.cpp
@@ -280,6 +280,8 @@
     return err;
 }
 
+}// namespace
+
 // ----------------------------------------------------------------------------
 // Screen refresh for native daemons linking dynamically to libqdutils
 // ----------------------------------------------------------------------------
@@ -288,5 +290,3 @@
   ret = screenRefresh();
   return ret;
 }
-
-}// namespace