sunxi: Re-enable h3 emac support

With the recent bug fixes for the sun8i_emac driver all known issues
are resolved, so we can re-enable the driver.

While at it, also enable the emac on the Orange Pi One.

Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Corentin LABBE <clabbe.montjoie@gmail.com>
Cc: Amit Singh Tomar <amittomer25@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Jagan Teki <jteki@openedev.com>