drivers: usb: stm32U5 usb device controller

Like the stm32H5, stm32u5 usb device has an independent
power supply, but control bit is PWR_SVMCR_USV.
The control bit for the stm32H5 is PWR_USBSCR_USB33SV (no change)

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