arm64: dts: mt8183: add mt8183 pumpkin board

arm64: dts: mt8183: add mt8183 pumpkin board

The MT8183 Pumpkin board is manufactured by OLogic and includes
a MediaTek MT8183 SoC with 2GB of RAM.

The board provides the following IOs:
	* 2 USB Type-A ports
	* Ethernet
	* Serial UART over micro-USB port
	* 1 USB Type-C dual role port
	* 1 USB Type-C power only port
	* 1 Jack for audio
	* RPI compatible header
	* MT7668 wiresless chip with Wi-Fi AC and BT 5
	* Micro-HDMI port
	* 2 connectors for CSI cameras
	* 1 connector for DSI display
	* 1 JTAG port

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Link: https://lore.kernel.org/r/20210217205945.830006-2-fparent@baylibre.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>