Merge branch 'dhylands-pin-af'

stmhal/Makefile

stmhal/boards/make-pins.py

stmhal/boards/stm32f4xx_af.csv

stmhal/boards/stm32f4xx_prefix.c

stmhal/mphal.h

stmhal/pin.c

stmhal/pin.h

stmhal/pin_defs_stmhal.c

stmhal/pin_named_pins.c

stmhal/qstrdefsport.h

teensy/Makefile

teensy/hal_gpio.c

teensy/main.c

teensy/make-pins.py

teensy/memzip_files/boot.py

teensy/mk20dx256_af.csv

teensy/mk20dx256_prefix.c

teensy/pin_defs_teensy.c

teensy/pin_defs_teensy.h

teensy/qstrdefsport.h