usb: dwc3: Update the wait times in dwc3_core_and_phy_soft_reset()

In the current code, wait times between PHY resets in
dwc3_core_and_phy_soft_reset() is not as per Hardware Programming Guide.
Update these values as per Hardware Programming Guide.

Change-Id: Ib86a2fde25b9305cf3633bcb43fc5afc80234a50
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>