Sergey Vlasov d00ac5dfb6 Add st-flash flash target (#9964)
* Add `st-flash` flash target

Add support for flashing the firmware via the `st-flash` utility from
the STLink Tools package (https://github.com/stlink-org/stlink).

* Add `st-flash` to the `qmk flash -b` output
2020-08-29 14:30:02 -07:00
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2020-08-29 14:30:02 -07:00
2020-08-28 08:03:42 -07:00
2020-07-16 15:49:18 +10:00