OMAP: DSS2: Clean up stallmode and io pad mode selection

Split the function dispc_set_parallel_interface_mode() into 2 separate
functions called dispc_mgr_set_io_pad_mode() and dispc_mgr_enable_stallmode().
The current function tries to set 2 different modes(io pad mode and stall mode)
based on a parameter omap_parallel_interface_mode which loosely corresponds to
the panel interface type.

This isn't correct because a) these 2 modes are independent to some extent,
b) we are currently configuring gpout0/gpout1 for DSI panels which is
unnecessary, c) a DSI Video mode panel won't get configured correctly.

Splitting the functions allows the interface driver to set these modes
independently and hence allow more flexibility.

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 20cad1b..c2c2fa7 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -4019,8 +4019,7 @@
 	dispc_mgr_set_lcd_display_type(dssdev->manager->id,
 			OMAP_DSS_LCD_DISPLAY_TFT);
 
-	dispc_mgr_set_parallel_interface_mode(dssdev->manager->id,
-			OMAP_DSS_PARALLELMODE_DSI);
+	dispc_mgr_enable_stallmode(dssdev->manager->id, true);
 	dispc_mgr_enable_fifohandcheck(dssdev->manager->id, 1);
 
 	dispc_mgr_set_tft_data_lines(dssdev->manager->id,