ARM: dts: rockchip: add gpu node to rk3288-miqi

Add the Mali GPU node to the MiQi device-tree.

Signed-off-by: Demetris Ierokipides <ierokipides.dem@gmail.com>
Link: https://lore.kernel.org/r/20210108151036.36434-2-ierokipides.dem@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>