A different configuration is applied when running this test
using west or using twister.
Both will use the disco_l475_iot1 overlay, but the extra config
for clock bus tunning is applied only when using twister and
samples is failed when run with west.
Move this extra config from sample.yaml to board .conf file so
it is applied in both cases.
Fixes#32376
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
Similarly to what was done for watchdog test,
update watchdog sample to be compatible with stm32 window watchdog
and enable testing by twister.
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
