Add FT81x support to display

[ONLYA]

The lvgl_esp32_drivers repo contains FT81x support in addition to the current display support.
Would someone fancy migrating the driver to this repo?
Or I could do that if I have time.

[ONLYA]

I am considering porting the code here.
FT81x chipset has both display and touch support. Where should I contain the code for it? display or indev? Or create a new folder like sdl named ft81x?

[kisvegabor]

Could you consider rather adding it to the LVGL repository directly? For v9 (under development) we add the driver directly to the LVGL repo. See https://github.com/lvgl/lvgl/tree/master/src/dev

[ONLYA]

I am using the v8.3 stable release for production so I would port the code to v8.3 first and then migrate to v9.
As I am not quite sure when the release date for v9 will be, I would adhere to v8.3 for now.

[kisvegabor]

Note that in this repo is not really maintained. Only a few high level drivers are being fixed (SDL, Wayland, etc).

However if adding the driver here is required step to migrate it to v9 later, I'm ok with that 🙂