boards: arm: nucleo_h723zg board enabling usart2

This enables defines the usart2 on PD5, PD6 pins
of the nucleo stm32h723zg target board. Pins are available
on the CN9 pin6 & 4 of the MB1364 nucleo144

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