[PATCH V2] backlight: ili9320: add missing SPI dependency

[Jingoo Han <jg1.han@samsung.com>]

This patch adds this missing SPI dependency and prevents
the driver from buiding without SPI, because funtion of
spi driver is used in this driver. So, it fixes link error
as belows:

drivers/video/backlight/ili9320.c:51: undefined reference to `spi_sync'

Also, prompt string for CONFIG_LCD_ILI9320 is added for
explicit selection.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Ben Dooks <ben-linux@fluff.org>
---
Changes since v1:
- commit log is modified to be more specific.

 drivers/video/backlight/Kconfig |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index c101697..765a945 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -60,7 +60,8 @@ config LCD_LTV350QV
 	  The LTV350QV panel is present on all ATSTK1000 boards.
 
 config LCD_ILI9320
-	tristate
+	tristate "ILI Technology ILI9320 controller support"
+	depends on SPI
 	help
 	  If you have a panel based on the ILI9320 controller chip
 	  then say y to include a power driver for it.
-- 
1.7.1