arm: dts: h6: Add Beelink GS1 initial support

Beelink GS1 is an Allwinner H6 based TV box,
which support:
- Allwinner H6 Quad-core 64-bit ARM Cortex-A53
- GPU Mali-T720
- 2GB LPDDR3 RAM
- 16GB eMMC
- AXP805 PMIC
- 1Gbps GMAC via RTL8211E
- USB 2.0 and 3.0 Host
- HDMI port
- S/PDIF port
- 5V/2A DC power supply
- Wi-Fi/BT via Fn-Link 6222B-SRB (RTL8222BS)

Linux commit details about the sun50i-h6-beelink-gs1.dts sync:
"arm64: dts: allwinner: h6: Introduce Beelink GS1 board"
(sha1: 089bee8dd119ba084dee6b17a2e1a53df4f30193)

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>