Not all supported boards actually use the RK3328's built-in GMACs, while the
SoC TRM and the datasheet don't define some standard numbering in this case.
Thus, remove the ethernet0 and ethernet1 aliases from the RK3328 SoC dtsi file,
and add the same alias back to the appropriate board dts(i) files.

These changes also touch one RK3318-based board dts, because it actually
depends on the RK3328 SoC dtsi and enables one of the GMACs.

This is quite similar to the already performed migration of the mmcX aliases
from the Rockchip SoC dtsi files to the board dts(i) files.
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/0c14f2e354d32f5d45c718ce16643553ca72f6a5.1702366958.git.dsimic@manjaro.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>