arm64: dts: mediatek: add device tree for Tungsten 700 board

arm64: dts: mediatek: add device tree for Tungsten 700 board

Add device tree to support Ezurio Tungsten 700 (MT8390) SMARC SOM [1] +
Universal SMARC carrier board [2].
It includes support for the MIPI-DSI BD070LIC3 display which uses the
Tianma TM070JDHG30 panel + TI SN65DSI84 MIPI-DSI to LVDS bridge [3].

[1] https://www.ezurio.com/product/tungsten700-smarc
[2] https://www.ezurio.com/system-on-module/accessories/universal-smarc-carrier
[3] https://www.ezurio.com/product/bd070lic3-7-touchscreen-display

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Gary Bisson <bisson.gary@gmail.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>