drm/omap: rename omapdrm device back

Now that creating the omapdrm device from the platform code has been
removed, we can rename the omapdrm device back to "omapdrm".

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -768,7 +768,7 @@ static SIMPLE_DEV_PM_OPS(omapdrm_pm_ops, omap_drm_suspend, omap_drm_resume);
 
 static struct platform_driver pdev = {
 	.driver = {
-		.name = "omapdrm_",
+		.name = "omapdrm",
 		.pm = &omapdrm_pm_ops,
 	},
 	.probe = pdev_probe,