arm64: dts: rockchip: add core devicetree for rk3326

The rk3326 is basically a px30 without the second display controller.
So add a dtsi based on that, that just removes the affected nodes.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Link: https://lore.kernel.org/r/20200414082938.2977572-1-heiko@sntech.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3326.dtsi

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2020 Fuzhou Rockchip Electronics Co., Ltd
+ */
+
+#include "px30.dtsi"
+
+&display_subsystem {
+	ports = <&vopb_out>;
+};
+
+/delete-node/ &dsi_in_vopl;
+/delete-node/ &lvds_vopl_in;
+/delete-node/ &vopl;
+/delete-node/ &vopl_mmu;