boards: scobc_a1: Cleanup OpenOCD script

The default OpenOCD interface for the SC-OBC Module A1 has changed to
CMSIS-DAP, with standard interfaces such as the Raspberry Pi Pico Debug
Probe.

To accommodate multiple debug interfaces, the OpenOCD scripts have been
cleaned up.

If you still wish to use FT2232D or FT232R interface,
please set the following environment variable before running
`west flash`:

  $ export OPENOCD_INTERFACE=FT2232D
  $ west flash

  $ export OPENOCD_INTERFACE=FT232R
  $ west flash

Signed-off-by: Takuya Sasaki <takuya.sasaki@spacecubics.com>
Signed-off-by: Gaetan Perrot <gaetan.perrot@spacecubics.com>