drm/exynos: Staticize exynos_dpi_of_find_panel_node

exynos_dpi_of_find_panel_node is local to this file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Inki Dae <inki.dae>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
index a9c52fe..a832364 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
@@ -235,7 +235,7 @@
 	FIMD_PORT_WRB,
 };
 
-struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
+static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
 {
 	struct device_node *np, *ep;