ARM: dts: imx7-colibri: multiple node updates

1. Move u-boot specific nodes to u-boot dts include: legacy lcdif
node and aliases.
2. Add iomux configuration for LCD.
3. Drop un-needed u-boot,dm-pre-reloc for alias node.
4. Fix display-timings, use the one from Toradex downstream kernel [1]

[1]: https://git.toradex.com/cgit/linux-toradex.git/tree/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi?h=toradex_4.9-2.3.x-imx#n206
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/arch/arm/dts/imx7-colibri-u-boot.dtsi b/arch/arm/dts/imx7-colibri-u-boot.dtsi
new file mode 100644
index 0000000..9138647
--- /dev/null
+++ b/arch/arm/dts/imx7-colibri-u-boot.dtsi
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright 2020 Toradex
+ */
+
+&lcdif {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lcdif_dat
+		     &pinctrl_lcdif_ctrl>;
+	display = <&display0>;
+	u-boot,dm-pre-reloc;
+
+	display0: display0 {
+		bits-per-pixel = <18>;
+		bus-width = <18>;
+		status = "okay";
+
+		display-timings {
+			native-mode = <&timing_vga>;
+			timing_vga: 640x480 {
+				clock-frequency = <25175000>;
+				hactive = <640>;
+				vactive = <480>;
+				hback-porch = <40>;
+				hfront-porch = <24>;
+				vback-porch = <32>;
+				vfront-porch = <11>;
+				hsync-len = <96>;
+				vsync-len = <2>;
+
+				de-active = <1>;
+				hsync-active = <0>;
+				vsync-active = <0>;
+				pixelclk-active = <0>;
+			};
+		};
+	};
+};