OMAPDSS: DSI: fix wrong unsigned long long use

dsi_configure_dispc_clocks() stores dsi func clock into unsigned long
long, but it should really be just unsigned long. Fix this.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dsi.c

@@ -4611,7 +4611,7 @@ static int dsi_configure_dispc_clocks(struct platform_device *dsidev)
 	struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
 	struct dispc_clock_info dispc_cinfo;
 	int r;
-	unsigned long long fck;
+	unsigned long fck;
 
 	fck = dsi_get_pll_hsdiv_dispc_rate(dsidev);