Display driver refactoring

[cepetr]

This PR focuses on refactoring the display driver and preparing it for entering and exiting low power mode.

[!!not ready for review yet]

1. Introduces new initialization and deinitialization routines: display_init(mode) and display_deinit(mode). These replace the previously used display_init(), display_reinit(), and display_finish_actions.
2. Splits ensure_compatible_settings() into a new function specific to the T model and incorporates the rest inside new display_init/display_deinit logic.
3. Enhances the robustness of the display driver API by introducing an initialized state to all display drivers.