OMAPDSS: add output->name

Add name field to omapdss's outputs so that in the following patches
panels refer to the output by their name. The name also helps debugging.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>
diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
index cb6b280..e393b6a 100644
--- a/drivers/video/omap2/dss/dpi.c
+++ b/drivers/video/omap2/dss/dpi.c
@@ -512,6 +512,7 @@
 	out->pdev = pdev;
 	out->id = OMAP_DSS_OUTPUT_DPI;
 	out->type = OMAP_DISPLAY_TYPE_DPI;
+	out->name = "dpi.0";
 
 	dss_register_output(out);
 }