New Braxtech Tablet with UT on mainline linux kernel

[libremax]

Called "Open Slate":

1. https://community.braxtech.net/t/open-slate-megathread/4041

2. https://rumble.com/v74par6-new-project-the-brax-open-slate-androidlinux-tablet.html

3. MKT Genio 720 specifications: https://www.mediatek.com/products/iot/genio-iot/genio-720

Note: On "mainline linux kernel" (or near mainline kernel and anyway recent kernel) for Ubuntu Touch is a guess of my part.