7390 (EWE Edition):
 * bump firmware version to 84.05.52 rev27393 ([http://download.ewe.de/avm/7390 security update])
 * compile-tested only
 * refs #2355


git-svn-id: file:///var/svn/freetz/trunk@11771 149334a1-2f27-0410-a3b9-fc62619ac1e6