ARM: dts: sun50i: H6: Sync from Linux v5.18-rc1

Copy the devicetree source for the H6 SoC and all existing boards
from the Linux v5.18-rc1 tag.

To maintain ABI compatibility with existing LTS kernels, one change
moving some IP blocks to the r_intc interrupt controller is excluded.
This effectively reverts Linux commits 189bef235dd3 and 73088dfee635.

This commit also adds the following new board devicetrees:
 - sun50i-h6-pine-h64-model-b.dts
 - sun50i-h6-tanix-tx6-mini.dts

This update should not impact any existing U-Boot functionality.

Signed-off-by: Samuel Holland <samuel@sholland.org>
diff --git a/arch/arm/dts/sun50i-h6-tanix-tx6-mini.dts b/arch/arm/dts/sun50i-h6-tanix-tx6-mini.dts
new file mode 100644
index 0000000..08d8416
--- /dev/null
+++ b/arch/arm/dts/sun50i-h6-tanix-tx6-mini.dts
@@ -0,0 +1,15 @@
+// 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";
+};