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Add stm32f7 HS USB driver #1478

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This PR aims to upstream the stm32f7 high speed USB driver which was developed for the Blackmagic Debug project.

This PR consists of two commits. The first is just adding more register definitions which I really hope won't cause too many objections to merging and will hopefully be easy to review.

The second commit adds the usb_f732 driver and doesn't modify any of the other code. I hope this way it is more acceptable to be merged as not to change any existing usb implementations, but just add the USB HS support for this chip.

Definitions USB PHY controller avaliable on the STM32F7x3xx and
STM32F730xx devices. As defined in ST RM0431.
return &_usbd_dev;
}

/* Note: the original 'usb_dwc_common.c' source code

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This comment should belong to the stashed_packets array variable, at lines 36-41

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