More updates for 8 extruders, REPEAT

Marlin/src/core/drivers.h

Marlin/src/feature/tmc_util.cpp

Marlin/src/gcode/feature/L6470/M122.cpp

Marlin/src/gcode/feature/L6470/M906.cpp

Marlin/src/gcode/feature/trinamic/M569.cpp

Marlin/src/gcode/feature/trinamic/M906.cpp

Marlin/src/gcode/host/M114.cpp

Marlin/src/lcd/extensible_ui/ui_api.cpp

Marlin/src/lcd/extensible_ui/ui_api.h

Marlin/src/libs/L64XX/L64XX_Marlin.cpp

Marlin/src/libs/L64XX/L64XX_Marlin.h

Marlin/src/module/configuration_store.cpp

Marlin/src/module/stepper/L64xx.cpp

Marlin/src/module/stepper/trinamic.cpp