sunxi: Add support for Tanix TX6

This commit adds support for Tanix TX6 TV box, based on H6. It's low end
H6 board, with 3 GiB of RAM, eMMC, fast ethernet, USB, IR and other
peripherals.

DT file is taken from Linux 5.11-rc1 release.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 5ff1a31..6358a53 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -614,7 +614,8 @@
 	sun50i-h6-beelink-gs1.dtb \
 	sun50i-h6-orangepi-lite2.dtb \
 	sun50i-h6-orangepi-one-plus.dtb \
-	sun50i-h6-pine-h64.dtb
+	sun50i-h6-pine-h64.dtb \
+	sun50i-h6-tanix-tx6.dtb
 dtb-$(CONFIG_MACH_SUN50I) += \
 	sun50i-a64-amarula-relic.dtb \
 	sun50i-a64-bananapi-m64.dtb \