boards: scobc_a1: Fix typo in OpenOCD config comment

The board support file `scobc-a1.cfg` contained a typo in the
default interface comment.

"Default CMIS-DAP" → "Default CMSIS-DAP"

This fixes the spelling of CMSIS-DAP to match the actual
debug interface.

Signed-off-by: Gaetan Perrot <gaetan.perrot@spacecubics.com>