Revert "buildroot/linux.config: disable ethernet for now"
Revert "buildroot/linux.config: disable ethernet for now"

This reverts commit c1975c4554e50a06174b7df6464c837a2f72587d.

litex-hub/linux-on-litex-vexriscv,litex-hub/linux-on-litex-vexriscv