feat(drivers/st/usb): add device driver for STM32MP1

Add a device driver for Synopsis DWC2 USB IP of STM32MP15x,
this USB OTG device is only supported in device mode.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I90b21f094f6637b85f3ace23a3a3a2f6fd4e0951
2 files changed