boards: update ina230 instances

The configuration definition for the ina230 has been changed in
f0f7f8b1 and now the old config option is marked as deprecated, which
is failing two boards in CI, nrf5340_audio_dk_nrf5340 and
stm32g071b_disco.

Update the ina230 config format to the new one for both boards.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>