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/da8xx.c b/drivers/usb/musb/da8xx.c
index a0dabb0..024751f 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -418,7 +418,6 @@
 	if (!rev)
 		goto fail;
 
-	usb_phy_generic_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv)) {
 		ret = -EPROBE_DEFER;
@@ -453,7 +452,6 @@
 	phy_off();
 
 	usb_put_phy(musb->xceiv);
-	usb_phy_generic_unregister();
 
 	return 0;
 }
@@ -512,6 +510,7 @@
 
 	pdata->platform_ops		= &da8xx_ops;
 
+	usb_phy_generic_register();
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
@@ -561,6 +560,7 @@
 	struct da8xx_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);