arm: dts: rockchip: rk3288: partial sync edp node

arm: dts: rockchip: rk3288: partial sync edp node

The rk3288 edp node has a phy node in Linux with a clock
property while current U-Boot driver expects this clock
on position index 1. Move U-Boot-specific DT clock properties
to rk3288-u-boot.dtsi and partially sync the edp node.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook-jerry
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>