Simplify stepper driver per-axis selection

Marlin/Configuration.h

Marlin/Configuration_adv.h

Marlin/src/HAL/HAL_AVR/SanityCheck.h

Marlin/src/HAL/HAL_DUE/SanityCheck.h

Marlin/src/HAL/HAL_LPC1768/SanityCheck.h

Marlin/src/Marlin.cpp

Marlin/src/config/default/Configuration.h

Marlin/src/config/default/Configuration_adv.h

Marlin/src/core/drivers.h

Marlin/src/core/macros.h

Marlin/src/feature/tmc_util.cpp

Marlin/src/feature/tmc_util.h

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

Marlin/src/gcode/feature/trinamic/M911-M915.cpp

Marlin/src/gcode/gcode.h

Marlin/src/inc/Conditionals_post.h

Marlin/src/inc/MarlinConfigPre.h

Marlin/src/inc/SanityCheck.h

Marlin/src/module/configuration_store.cpp

Marlin/src/module/stepper_indirection.cpp