OMAPDSS: DISPC: use dss_feat_get_num_ovls()

Use dss_feat_get_num_ovls() in dispc.c instead of
omap_dss_get_num_overlays() to remove the dependency to overlay.c. Note
that we still have uses of omap_dss_get_num_overlays() in dispc.c, but
these will be moved out in the future patches.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dispc.c

@@ -1046,7 +1046,7 @@ static void dispc_configure_burst_sizes(void)
 	const int burst_size = BURST_SIZE_X8;
 
 	/* Configure burst size always to maximum size */
-	for (i = 0; i < omap_dss_get_num_overlays(); ++i)
+	for (i = 0; i < dss_feat_get_num_ovls(); ++i)
 		dispc_ovl_set_burst_size(i, burst_size);
 }
 
@@ -1250,7 +1250,7 @@ void dispc_ovl_compute_fifo_thresholds(enum omap_plane plane,
 
 	if (use_fifomerge) {
 		total_fifo_size = 0;
-		for (i = 0; i < omap_dss_get_num_overlays(); ++i)
+		for (i = 0; i < dss_feat_get_num_ovls(); ++i)
 			total_fifo_size += dispc_ovl_get_fifo_size(i);
 	} else {
 		total_fifo_size = ovl_fifo_size;