video: da8xx-fb: Staticize reg_context

'reg_context' is local to this file. Make it static.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 70fc8e8..0670c85 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -1548,7 +1548,7 @@
 }
 
 #ifdef CONFIG_PM
-struct lcdc_context {
+static struct lcdc_context {
 	u32 clk_enable;
 	u32 ctrl;
 	u32 dma_ctrl;