Use uint8_t for all fan speeds (#12032)

Marlin/src/Marlin.cpp

Marlin/src/Marlin.h

Marlin/src/feature/controllerfan.cpp

Marlin/src/feature/power.cpp

Marlin/src/feature/power_loss_recovery.cpp

Marlin/src/feature/power_loss_recovery.h

Marlin/src/gcode/control/M42.cpp

Marlin/src/gcode/control/M80_M81.cpp

Marlin/src/gcode/lcd/M145.cpp

Marlin/src/gcode/parser.h

Marlin/src/gcode/temperature/M106_M107.cpp

Marlin/src/lcd/dogm/status_screen_DOGM.h

Marlin/src/lcd/dogm/status_screen_lite_ST7920.h

Marlin/src/lcd/dogm/u8g_dev_st7920_128x64_HAL.cpp

Marlin/src/lcd/malyanlcd.cpp

Marlin/src/lcd/ultralcd.cpp

Marlin/src/lcd/ultralcd.h

Marlin/src/lcd/ultralcd_impl_HD44780.h

Marlin/src/libs/softspi.h

Marlin/src/module/configuration_store.cpp