drivers: gpio: STM32U5 independant IO supply
drivers: gpio: STM32U5 independant IO supply

Fix the enabling of the independant IO supply.
Function LL_PWR_EnableVddIO2 is called LL_PWR_EnableVDDIO2 on U5.

Signed-off-by: Guillaume Gautier <e28e80dbfe775b004d795f1da419a83f9db15384@st.com>

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