tegra: make local functions static

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/arch/arm/cpu/armv7/tegra20/display.c b/arch/arm/cpu/armv7/tegra20/display.c
index fd77f3f..d98cec9 100644
--- a/arch/arm/cpu/armv7/tegra20/display.c
+++ b/arch/arm/cpu/armv7/tegra20/display.c
@@ -194,7 +194,8 @@
 		writel(rgb_sel_tab[i], &com->pin_output_sel[i]);
 }
 
-int setup_window(struct disp_ctl_win *win, struct fdt_disp_config *config)
+static int setup_window(struct disp_ctl_win *win,
+			struct fdt_disp_config *config)
 {
 	win->x = 0;
 	win->y = 0;