usb: otg: support for multiple transceivers by a single controller

Add a linked list for keeping multiple PHY instances with different
types so that we can have separate USB2 and USB3 PHYs on one single
board. _get_phy_ has been changed so that the controller gets
the transceiver by type. _remove_phy_ has been added to let the phy
be removed from the phy list.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index cf5ffc4..6bd6f1c 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -2688,7 +2688,7 @@
 		goto free_ac;
 	}
 
-	di->usb_phy = usb_get_phy();
+	di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (!di->usb_phy) {
 		dev_err(di->dev, "failed to get usb transceiver\n");
 		ret = -EINVAL;