usb: host: xhci-plat: omit shared hcd if either root hub has no ports

Activate the just added extension for xhci-plat and omit the shared
hcd if either of the root hubs has no ports.

Signed-off-by: Heiner Kallweit <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/usb/host/xhci-plat.c

@@ -245,6 +245,8 @@ static int xhci_plat_probe(struct platform_device *pdev)
 
 	xhci = hcd_to_xhci(hcd);
 
+	xhci->allow_single_roothub = 1;
+
 	/*
 	 * Not all platforms have clks so it is not an error if the
 	 * clock do not exist.