ARM: dts: rockchip: add vop device node for rk3036

The rk3036 support two overlay plane and one hwc plane,
it supports IOMMU, and its IOMMU same as rk3288's.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>