OMAPDSS: add THIS_MODULE owner to DSS outputs

Setup the owner field for DSS output's omap_dss_device so that module
refcounting works.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
index 482b918..892a2b2 100644
--- a/drivers/video/omap2/dss/dpi.c
+++ b/drivers/video/omap2/dss/dpi.c
@@ -687,6 +687,7 @@
 	out->output_type = OMAP_DISPLAY_TYPE_DPI;
 	out->name = "dpi.0";
 	out->dispc_channel = dpi_get_channel();
+	out->owner = THIS_MODULE;
 
 	dss_register_output(out);
 }