video: add lm3533 backlight driver

This is basic lm3533 driver only with bank A and backlight cell
support.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # LG P880 T30
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index a609e35..0d28eff 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -28,6 +28,7 @@
 
 endif
 
+obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_backlight.o
 obj-${CONFIG_EXYNOS_FB} += exynos/
 obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
 obj-${CONFIG_VIDEO_STM32} += stm32/