ARM: dts: add dtsi for exynos7870-j6lte (Samsung Galaxy J6)

Add a framebuffer node to the DTSI in order to ensure that display
continues to work, as since v6.19 of devicetree-rebasing sources, it
uses Samsung's DECON (Display Enhancement CONtroller) for display, which
is, as of yet, not supported in U-Boot.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/dts/exynos7870-j6lte-u-boot.dtsi

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Kaustabh Chakraborty <kauschluss@disroot.org>
+ */
+
+/ {
+	chosen {
+		#address-cells = <2>;
+		#size-cells = <1>;
+		ranges;
+
+		framebuffer@67000000 {
+			compatible = "simple-framebuffer";
+			reg = <0x0 0x67000000 (720 * 1480 * 4)>;
+			width = <720>;
+			height = <1480>;
+			stride = <(720 * 4)>;
+			format = "a8r8g8b8";
+		};
+	};
+};