Enable execution of ADC driver tests on nrf54l15.
Overlay file for nrf54l15 already exists.
Signed-off-by: Sebastian Głąb <sebastian.glab@nordicsemi.no>
Add a missing space in the regular expression that defines the expected
console output so that it matches what the sample actually produces.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>