misc: Support for STM32401CD Blackpill as debug probe

[lasutek]

Detailed description

Add support for Blackpill board with STM32401CD as debug probe.

Text on MCU (topside of Blackpill board):
STM32F
401CDU6
GQ21H 16i VQ
CHN GQ 739
"Pin 1 mark" "ST logo" "e3" "Z"

Text on backside of Blackpill board:
WeAct
V3.0

Difference between stm32f401cd, and for example the already supported stm32f401ce, is the amount of available Flash. So technically, only the definition of memory region for rom (flash) in the linker script will differ between these MCU's.

Flash / RAM	MCU
512 K / 96 K	STM32401CE
384 K / 96 K	STM32401CD
256 K / 64 K	STM32401CC
128 K / 64 K	STM32401CB

Your checklist for this pull request

• I've read the Code of Conduct
• I've read the guidelines for contributing to this repository
• It builds for hardware native (see Building the firmware)
• It builds as BMDA (see Building the BMDA)
• I've tested it to the best of my ability
• My commit messages provide a useful short description of what the commits do

Closing issues