tests: drivers: i2c: i2c_target_api: add stm32h573i_dk

Add necessary overlay and stm32h573i_dk in i2c_target_api test case
to enable the board.

Signed-off-by: IBEN EL HADJ MESSAOUD Marwa <marwa.ibenelhadjmessaoud-ext@st.com>
4 files changed