video: exynos_fb: Remove callbacks from the driver

Replaced the functionality of callbacks by using a standard set of functions.
Instead of implementing and hooking up a callback, put the same code in one of
the standard set of functions by overriding it.

This patch is tested only on SMDK5250.
For Trats and universal_c210 board, it is only compile tested.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 9207646..e20fb3d 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -635,7 +635,7 @@
 	return 0;
 }
 
-static void lcd_reset(void)
+void exynos_reset_lcd(void)
 {
 	struct exynos4_gpio_part2 *gpio2 =
 		(struct exynos4_gpio_part2 *)samsung_get_base_gpio_part2();
@@ -755,10 +755,6 @@
 	.vl_cmd_allow_len = 0xf,
 
 	.win_id		= 3,
-	.cfg_gpio	= NULL,
-	.backlight_on	= NULL,
-	.lcd_power_on	= NULL,	/* lcd_power_on in mipi dsi driver */
-	.reset_lcd	= lcd_reset,
 	.dual_lcd_enabled = 0,
 
 	.init_delay	= 0,