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/isp1704_charger.c b/drivers/power/isp1704_charger.c
index 50773ae6..090e5f9 100644
--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -415,7 +415,7 @@
 	if (!isp)
 		return -ENOMEM;
 
-	isp->phy = usb_get_phy();
+	isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (!isp->phy)
 		goto fail0;