Revert "ARM: dts: sun8i: h3: Enable dwmac-sun8i on the Beelink X2"

This reverts commit ddb56254. The EMAC
bindings have not stabilized yet, so we can't commit to keeping them
stable.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>