UPSTREAM: ARM: dts: rockchip: Setup rk3288 ethernet0 alias for u-boot

UPSTREAM: ARM: dts: rockchip: Setup rk3288 ethernet0 alias for u-boot

Add an ethernet0 alias for the RK3288 mac interface so
that u-boot can find the device-node and fill in the mac address on
boards that support a wired network interface.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Change-Id: Ie8c4e0d90b62278485446f614fce0c95145432d9
(cherry picked from commit 85ef8d611f4b0216bc4f96487a0408d5c887f6f9)
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>