[configs] remove ppp support and some kernel debug flags

* remove kernel debug information
* remove kernel symbol table information

DEBUGFS still set (needed by batctl)
[configs] strip polarssl

Only client mode is need (no server or HTTP/SSH proxy support)
[packages] refactoring and removing unnecessary entries
Add support for different default packages list

There a many legacy routers with only 4MB flash memory. It would be cool if we could support
them. This patch refactors our Makefile to support a suffix in profiles/*.profiles. With
this suffix you can alter the default package list.
Add minimal package lists for 4MB flash devices
rename package list 'minimal' to 'vpn'
[feeds] ffwizard-berlin - only configure statistics if installed
[feeds] ffwizard-berlin - only configure statistics if installed
Merge branch 'features/strip_binary_size'