sanitycheck: allow device runner board-id to differ from board id

Boards like mimxrt1060_evk are recognized by the scanner through their
USB device which has an ID, but in some cases the board may be
programmed using an external J-Link probe.  Support this by adding a
probe_id key that can be added to the yaml dictionary to override the
use of id for this purpose.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>