Improve STEVAL_3DP001V1 and future STEVAL_* support (#16404)

Marlin/src/core/boards.h

Marlin/src/inc/SanityCheck.h

Marlin/src/pins/pins.h

Marlin/src/pins/stm32/pins_STEVAL.h

Marlin/src/pins/stm32/pins_STEVAL_3DP001V1.h

buildroot/share/PlatformIO/boards/STEVAL_STM32F401VE.json

buildroot/share/PlatformIO/scripts/STEVAL__F401XX.py

.../share/PlatformIO/variants/STEVAL_F401VE/PeripheralPins.c

...oot/share/PlatformIO/variants/STEVAL_F401VE/PinNamesVar.h

...share/PlatformIO/variants/STEVAL_F401VE/hal_conf_custom.h

...droot/share/PlatformIO/variants/STEVAL_F401VE/ldscript.ld

buildroot/share/PlatformIO/variants/STEVAL_F401VE/variant.h

platformio.ini