drm/exynos: remove unused codes in hdmi and mixer

Some members in struct mixer_context aren't used and the define
HDMI_OVERLAY_NUMBER is unused in hdmi driver, remove them.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -40,7 +40,6 @@
 
 #include "exynos_hdmi.h"
 
-#define HDMI_OVERLAY_NUMBER	3
 #define MAX_WIDTH		1920
 #define MAX_HEIGHT		1080
 #define get_hdmi_context(dev)	platform_get_drvdata(to_platform_device(dev))

drivers/gpu/drm/exynos/exynos_mixer.c

@@ -75,13 +75,10 @@ struct mixer_resources {
 };
 
 struct mixer_context {
-	struct fb_videomode	*default_timing;
 	unsigned int		default_win;
-	unsigned int		default_bpp;
 	unsigned int		irq;
 	int			pipe;
 	bool			interlace;
-	bool			vp_enabled;
 
 	struct mixer_resources	mixer_res;
 	struct hdmi_win_data	win_data[HDMI_OVERLAY_NUMBER];