tests: drivers: adc testing the adc_api on stm32u585 disco board
tests: drivers: adc testing the adc_api on stm32u585 disco board

This PR configures the test case to run the adc_api on the
b_u585i_iot02a disco board from STMicroelectonics.
Channel 15 is choosen

Signed-off-by: Francois Ramu <b83adc7f8a23ee911a37fcb61c4033581aae0b7a@st.com>

galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr