usb: Add support for STM32 family USB driver

This is a USB controller driver for STM32F4xx devices using
the STM32 Cube HAL_PCD framework. This has been tested with
the cdc_acm driver on a 96b_carbon board (STM32F401RE).

This is a refactoring of:
usb: usb_dc_stm: Add support for STM32Cube HAL_PCD USB driver
Signed-off-by: Christer Weinigel <christer@weinigel.se>
[daniel.thompson@linaro.org: Removed STM32F40(157) defconfig changes
together with STM32F4Discovery pinmux and defconfig changes, updated
clock settings and pad configuration to match latest mainline]
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
[giannis.damigos@gmail.com: Change uint*_t types to u*_t types,
change SYS_LOG_USB_DC_STM_LEVEL to SYS_LOG_USB_DRIVER_LEVEL and
update pinmux to match latest arm branch]
Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>