usb: dwc2: add support for STM32MP1

Add compatible "st,stm32mp1-hsotg" and associated driver data to manage
the usb33d-supply and the ST specific register for VBus sensing.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
# Conflicts:
#	drivers/usb/gadget/dwc2_udc_otg.c
Reviewed-by: Lukasz Majewski <lukma@denx.de>