boards: arm: blackpill_f411ce: add blackmagicprobe
boards: arm: blackpill_f411ce: add blackmagicprobe

Adds support for flashing the blackmagicprobe target
for the blackpill_f411ce board.

Signed-off-by: Kalyan Sriram <0a87ba2c04b2161fe6afda1ecf1461a7d5060e39@coderkalyan.com>

nashif/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr