drivers: usb_dc_dw: add definition for GHWCFG1..4 registers

Add definition for GHWCFG1..4 registers to be able to obtain basic
information about PHY, endpoints, and Data FIFO.

Add GGPIO defines for STM32F4 SoC family USB controllers.
This implementation uses GGPIO to enable transceiver, VBUS
detection, and a few other functions.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>