drm/imx: merge imx-drm-core and ipuv3-crtc in one module

While it is possible to hook other CRTC implementations into imx-drm
in practice there are none yet and the option to disable ipuv3-crtc
support has been hidden for a long time.

Now that the imx-drm-core has learned to deal with some of the
specifics of IPUv3 there is a cyclic dependency between both parts.
To get rid of this and to decimate the Kconfig maze a bit, simply
merge both parts into one module.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index dab9d50..5456c15 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -465,16 +465,10 @@ static int ipu_drm_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct platform_driver ipu_drm_driver = {
+struct platform_driver ipu_drm_driver = {
 	.driver = {
 		.name = "imx-ipuv3-crtc",
 	},
 	.probe = ipu_drm_probe,
 	.remove = ipu_drm_remove,
 };
-module_platform_driver(ipu_drm_driver);
-
-MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:imx-ipuv3-crtc");