backlight refactoring + TPS61062 driver #4552
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This PR refactors backlight driver and introduces new TPS61062 driver for T3W1.
During refactoring, backlight functionality was separated into its own module, even though we will still use it mostly through display driver.
PVD IRQ was modified to use a bit cleaner access to backlight.
Some bootloader-firmware transitions were fixed to account for the BACKLIGHT_RESET jump behavior on some models.
For D002 devkit, separate PIN backlight driver was introduced, that just switches the backlight on/off. This is done in order to keep the main ltdc-dsi driver cleaner, and it allows better testing while working on D002. It has some negative side effect that fading looks bad on D002, but as its a devkit i don't think we should care much.
The TPS61062 driver uses digital brightness control, and for the generation of pulses TIM+DMA is used.
supersedes #4481