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>
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 2b990da..9a14553 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -768,7 +768,7 @@
 
 static struct platform_driver pdev = {
 	.driver = {
-		.name = "omapdrm_",
+		.name = "omapdrm",
 		.pm = &omapdrm_pm_ops,
 	},
 	.probe = pdev_probe,