EWE 05.2x:
 * drop the (de-facto missing) support for EWE 05.2x firmwares
 * refs #2455


git-svn-id: http://svn.freetz.org/trunk@11976 149334a1-2f27-0410-a3b9-fc62619ac1e6
 * rename (for consistency reasons) all {{{FREETZ_AVM_HAS_FWXYZ}}} symboles to {{{FREETZ_AVM_HAS_FIRMWARE_0X_YZ}}}
 * the naming scheme is now identical for {{{FREETZ_AVM_HAS_FIRMWARE}}}, {{{FREETZ_TYPE_FIRMWARE}}}, and {{{FREETZ_AVM_VERSION}}} symbols


git-svn-id: http://svn.freetz.org/trunk@11977 149334a1-2f27-0410-a3b9-fc62619ac1e6