arm64: dts: allwinner: h6: Add Tanix TX6 mini dts

Tanix TX6 mini is less capable version of Tanix TX6 although it comes
with some features not present on Tanix TX6.

Basic specs:
- H6 SoC
- 2 GiB DDR3 RAM
- HDMI
- SPDIF
- 2x USB
- analogue audio
- CVBS
- SD card
- IR remote
- LED display
- fast ethernet
- XR819 wifi
- 16 GiB eMMC

Currently supported features doesn't differ that much from Tanix TX6,
but that will change soon.
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm64/boot/dts/allwinner/Makefile

@@ -37,3 +37,4 @@ dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-orangepi-one-plus.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-pine-h64.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-pine-h64-model-b.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-tanix-tx6.dtb
+dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-tanix-tx6-mini.dtb

arch/arm64/boot/dts/allwinner/sun50i-h6-tanix-tx6-mini.dts

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+// Copyright (c) 2021 Jernej Skrabec <jernej.skrabec@gmail.com>
+
+/dts-v1/;
+
+#include "sun50i-h6-tanix.dtsi"
+
+/ {
+	model = "Tanix TX6 mini";
+	compatible = "oranth,tanix-tx6-mini", "allwinner,sun50i-h6";
+};
+
+&r_ir {
+	linux,rc-map-name = "rc-tanix-tx3mini";
+};