viafb: rename display_timing to via_display_timing

The struct display_timing is specific to the via subsystem. The naming leads to
collisions with the new struct display_timing, which is supposed to be a shared
struct between different subsystems.
To clean this up, prepend the existing struct with the subsystem it is specific
to.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
diff --git a/drivers/video/via/lcd.c b/drivers/video/via/lcd.c
index 980ee1b..5d21ff4 100644
--- a/drivers/video/via/lcd.c
+++ b/drivers/video/via/lcd.c
@@ -549,7 +549,7 @@
 	int panel_hres = plvds_setting_info->lcd_panel_hres;
 	int panel_vres = plvds_setting_info->lcd_panel_vres;
 	u32 clock;
-	struct display_timing timing;
+	struct via_display_timing timing;
 	struct fb_var_screeninfo panel_var;
 	const struct fb_videomode *mode_crt_table, *panel_crt_table;