usb: phy: generic: Add wakeup capability

In case USB phy is the wakeup source, enable its wakeup
capability.

Signed-off-by: Li Jun <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/phy/phy-generic.c

···
 static int usb_phy_generic_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *dn = dev->of_node;
 	struct usb_phy_generic	*nop;
 	int err;
 
···
 	}
 
 	platform_set_drvdata(pdev, nop);
+
+	device_set_wakeup_capable(&pdev->dev,
+				  of_property_read_bool(dn, "wakeup-source"));
 
 	return 0;
 }