05.2x firmware series:
 * drop support for all 05.2x-firmwares with no security fix from AVM (as of now by just disabling them in menuconfig, provided no complaints come up within the next 4 weeks we will also drop the corresponding code basis)
 * refs #2455


git-svn-id: file:///var/svn/freetz/trunk@12254 149334a1-2f27-0410-a3b9-fc62619ac1e6