[media] call media_device_init() before registering the V4L2 device

Currently, v4l2_device_register() doesn't use the media_device
struct. So, calling media_device_init() could be called either
before or after v4l2_device_register().

Yet, it is a good practice to initialize everything before calling
the register functions. Also, the other drivers call
media_device_init() before registering the V4L2 device.

So, move the call for media_device_init() to happen earlier on
exynos4-is and s3c-camif.

This is just a cleanup patch.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/exynos4-is/media-dev.c

@@ -1356,14 +1356,14 @@ static int fimc_md_probe(struct platform_device *pdev)
 	fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
 	fmd->user_subdev_api = true;
 
+	media_device_init(&fmd->media_dev);
+
 	ret = v4l2_device_register(dev, &fmd->v4l2_dev);
 	if (ret < 0) {
 		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
 		return ret;
 	}
 
-	media_device_init(&fmd->media_dev);
-
 	ret = fimc_md_get_clocks(fmd);
 	if (ret)
 		goto err_md;