usb: dwc2: Extract register definitions to common header file

The same registers are accessed in both the otg and gatet drivers of
dwc2, and these registers are repeatedly defined in these two parts.
Extract register definitions into a common header file to reduce
redundancy and make the code more maintainable.

Signed-off-by: Kongyang Liu <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Tested-by: Peter Robinson <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Signed-off-by: Junhui Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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