OMAP: DSS2: use __exit for selected panel drivers

We can use __exit for the driver remove function in plain dss panels
(ie. those that do not need i2c or spi).

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/displays/panel-generic-dpi.c b/drivers/video/omap2/displays/panel-generic-dpi.c
index 2251f73..27b9943 100644
--- a/drivers/video/omap2/displays/panel-generic-dpi.c
+++ b/drivers/video/omap2/displays/panel-generic-dpi.c
@@ -286,7 +286,7 @@
 	return 0;
 }
 
-static void generic_dpi_panel_remove(struct omap_dss_device *dssdev)
+static void __exit generic_dpi_panel_remove(struct omap_dss_device *dssdev)
 {
 	struct panel_drv_data *drv_data = dev_get_drvdata(&dssdev->dev);
 
@@ -359,7 +359,7 @@
 
 static struct omap_dss_driver dpi_driver = {
 	.probe		= generic_dpi_panel_probe,
-	.remove		= generic_dpi_panel_remove,
+	.remove		= __exit_p(generic_dpi_panel_remove),
 
 	.enable		= generic_dpi_panel_enable,
 	.disable	= generic_dpi_panel_disable,