Use bit flags for homed/known

Marlin/src/Marlin.cpp

Marlin/src/Marlin.h

Marlin/src/gcode/calibrate/G28.cpp

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

Marlin/src/lcd/dogm/status_screen_DOGM.h

Marlin/src/lcd/dogm/status_screen_lite_ST7920.h

Marlin/src/lcd/ultralcd.cpp

Marlin/src/lcd/ultralcd_impl_HD44780.h

Marlin/src/module/delta.cpp

Marlin/src/module/motion.cpp

Marlin/src/module/probe.cpp

Marlin/src/module/temperature.h

Marlin/src/module/tool_change.cpp