carambola2: there is no reset button on GPIO12
opkg: update default carambola2 repo version
feeds: update, enable more kernel modules, packages. Reorganize .config

Move full config (with all packages in repo enabled) to 'config_full',
please copy it to '.config' when building all packages.
'.config' now contains minimal config to build only packages required by
firmware image. Should be easier starting point for new users.

Added routing and telephony feeds to feed config. Please uncomment them
when building from 'config_full'.