feat(sys-kernel/x86_64_defconfig) enable more networking drivers

Some Intel ones, Mellanox, Micrel, and Myri.
feat(sys-kernel/x86_64_defconfig) enable even more networking drivers

Atheros, Chelsio, Dlink, and a few more gigabit network controllers
Merge pull request #178 from gregkh/kernel_update

Kernel update - more gigabit ethernet drivers enabled.