ARM: chiliboard: move towards driver model and device-tree boot

This patch mostly enables DM drivers in board defconfig and all their
dependencies. Additionally we remove ethernet platform data, as all
details are in device-tree now.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: Tom Rini <trini@konsulko.com>