usb: dwc3: fix PHY disable sequence

Generic PHYs must be powered-off before they can be tore down.

Similarly, suspending legacy PHYs after having powered them off makes no
sense.

Fix the dwc3_core_exit() (e.g. called during suspend) and open-coded
dwc3_probe() error-path sequences that got this wrong.

Note that this makes dwc3_core_exit() match the dwc3_core_init() error
path with respect to powering off the PHYs.

Fixes: 03c1fd622f72 ("usb: dwc3: core: add phy cleanup for probe error handling")
Fixes: c499ff71ff2a ("usb: dwc3: core: re-factor init and exit paths")
Cc: [email protected]      # 4.8
Reviewed-by: Andrew Halaney <[email protected]>
Reviewed-by: Matthias Kaehlcke <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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