[riot-notifications] [RIOT-OS/RIOT] mk/boards/stm32: add JLink support (#14017)

Hauke Petersen notifications at github.com
Mon May 4 16:44:21 CEST 2020

### Contribution description
The Jlink programmers are also capable of flashing STM32 targets via SWD - useful if you want to flash an stm32-based board and that is the only programmer available to you :-)

So this little PR adds support to use a Jlink for programming STM32 devices, simply cal `PROGRAMMER=jlink make flash`. I tested this with the `blxxpill`-boards, but it should work fine with every other stm32-based one. 

When having a look at the [list of supported stm32 devices](https://www.segger.com/downloads/supported-devices.php), the names that Segger uses for their targets are the same that RIOT boards define in their `CPU_MODEL` variable.

### Testing procedure
- take any stm32-based board (e.g. `bluepill`)
- connect programmin gpins to a Segger Jlink programmer (GND, SWDIO, SWCLK, VTref), see e.g. https://www.segger.com/products/debug-probes/j-link/technology/interface-description/
- flash any RIOT application to that board using the Jlink programmer by running `PROGRAMMER=jlink make flash`
- make sure your application is now running at your board

### Issues/PRs references
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-- Commit Summary --

  * mk/boards/stm32: add JLink support

-- File Changes --

    M makefiles/boards/stm32.inc.mk (7)

-- Patch Links --


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