tests: dac: testing dac loopback on stm32f746zg board

This adds the config to PASS the tests/drivers/dac/dac_loopback
on the nucleo_f746zg board, when PA0 and PA4 are connected.
The DTS of the nucleo_f746zg defines the ADC1 ch0 and DAC1 ch1.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
2 files changed