boards: nrf5340dk_nrf5340: Fix arguments for jlink runners

For the application core, the `--device` parameter specifies only
the generic `cortex-m33`, so it is impossible for the debugger to
flash the target.
For the network core, the `--device` parameter is not present at all,
so it is even impossible to run the `debug` command.

This commit fixes the above issues by specifying the proper devices.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
1 file changed