OMAPDSS: Apply manager timings instead of direct DISPC writes

Replace the function dispc_mgr_set_timings() with dss_mgr_set_timings() in the
interface drivers. The latter function ensures that the timing related DISPC
registers are configured according to the shadow register programming model.

Remove the call to dispc_mgr_go() in dpi_set_timings() as the manager's go bit
is set by dss_mgr_set_timings().

Signed-off-by: Archit Taneja <archit@ti.com>
diff --git a/drivers/video/omap2/dss/venc.c b/drivers/video/omap2/dss/venc.c
index 30bbb63..e237464 100644
--- a/drivers/video/omap2/dss/venc.c
+++ b/drivers/video/omap2/dss/venc.c
@@ -444,7 +444,7 @@
 	timings = dssdev->panel.timings;
 	timings.y_res /= 2;
 
-	dispc_mgr_set_timings(dssdev->manager->id, &timings);
+	dss_mgr_set_timings(dssdev->manager, &timings);
 
 	r = regulator_enable(venc.vdda_dac_reg);
 	if (r)