usb: dwc3: remove custom unique id handling

The lockless implementation of the unique id is quite impressive (:P)
but dirver's core can handle it, we can remove it and make our code a
little smaller.

Cc: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index ee57a10..900d435 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -272,7 +272,6 @@
 	struct resource		*res;
 	struct device		*dev = &pdev->dev;
 
-	int			devid;
 	int			size;
 	int			ret = -ENOMEM;
 	int			irq;
@@ -315,14 +314,10 @@
 		return ret;
 	}
 
-	devid = dwc3_get_device_id();
-	if (devid < 0)
-		return -ENODEV;
-
-	dwc3 = platform_device_alloc("dwc3", devid);
+	dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 	if (!dwc3) {
 		dev_err(dev, "couldn't allocate dwc3 device\n");
-		goto err1;
+		return -ENOMEM;
 	}
 
 	context = devm_kzalloc(dev, resource_size(res), GFP_KERNEL);
@@ -423,10 +418,6 @@
 
 err2:
 	platform_device_put(dwc3);
-
-err1:
-	dwc3_put_device_id(devid);
-
 	return ret;
 }
 
@@ -437,9 +428,6 @@
 	platform_device_unregister(omap->dwc3);
 	platform_device_unregister(omap->usb2_phy);
 	platform_device_unregister(omap->usb3_phy);
-
-	dwc3_put_device_id(omap->dwc3->id);
-
 	return 0;
 }