xhci: hub: export symbol on xhci_hub_control

XHCI host drivers may override the default xhci_hub_control() with
their own device specific function. To allow these host drivers to
call the xhci_hub_control() function from within their own
hub_control() callback and be built as a module, export the symbol
for xhci_hub_control.

Signed-off-by: Jim Lin <[email protected]>
Reviewed-by: Jon Hunter <[email protected]>
Tested-by: Jon Hunter <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Acked-by: Mathias Nyman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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