tests: drivers: counter basic api running on the stm32h573i_dk

Run the tests/drivers/counter/counter_basic_api on the stm32h573i_dk
disco kit, enabling the counter mode for the GP Timers2 & Timers3
Prescaler is giving a 1MHz freq

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