usb: musb: move usb_phy_generic_{un,}register calls to probe()/remove()

This patch is in preparation to supporting
calling those functions multiple times.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index 7370354..de8492b 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -381,7 +381,6 @@
 	u32		revision;
 	int 		ret = -ENODEV;
 
-	usb_phy_generic_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv)) {
 		ret = -EPROBE_DEFER;
@@ -487,7 +486,6 @@
 	phy_off();
 
 	usb_put_phy(musb->xceiv);
-	usb_phy_generic_unregister();
 
 	return 0;
 }
@@ -545,6 +543,7 @@
 
 	pdata->platform_ops		= &davinci_ops;
 
+	usb_phy_generic_register();
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
@@ -603,6 +602,7 @@
 	struct davinci_glue		*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister();
 	clk_disable(glue->clk);
 	clk_put(glue->clk);
 	kfree(glue);