Mini2440 modify 3.11: modify LCD Backlight driver

There are some differeces.
1.The current position is drivers/video/backlight/.

Graphics support  --->
 Backlight & LCD device support  --->
  <*> Lowlevel Backlight controls
  <*> Backlight support for mini2440 from FriendlyARM

2.
s3c2410_gpio_setpin => gpio_set_value
s3c2410_gpio_cfgpin => s3c_gpio_cfgpin
Fixed:
  CC      drivers/video/backlight/mini2440_backlight.o
drivers/video/backlight/mini2440_backlight.c: In function 'set_bl':
drivers/video/backlight/mini2440_backlight.c:38: error: implicit declaration of function 's3c2410_gpio_setpin'
drivers/video/backlight/mini2440_backlight.c: In function 'dev_init':
drivers/video/backlight/mini2440_backlight.c:101: error: implicit declaration of function 's3c2410_gpio_cfgpin'
Mini2440 modify 3.12: modify LCD driver

There are some differeces.
The current position to configure.

Graphics support  --->
 Backlight & LCD device support  --->
  <*> Lowlevel LCD controls
  (X) 3.5 inch 320X240 TFT Landscape LCD