ARM: dts: rockchip: move edp assigned-clocks to edp node on rk3288

ARM: dts: rockchip: move edp assigned-clocks to edp node on rk3288

The rk3288 power-controller node contains an assigned-clocks property
that conflicts with the bindings. From the git history it shows that they
wanted to assign the rk3288 EDP_24M clock input centrally before an edp
node was available. Move the edp assigned-clocks property to the edp node
to reduce dtbs_check output.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://patch.msgid.link/7d6fa223-ab90-4c44-9180-54df78467ea5@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>