Convert CONFIG_VIDEO_OMAP3 to Kconfig

This converts the following to Kconfig:
   CONFIG_VIDEO_OMAP3

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index ecb57d8..ed0b21f 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -408,6 +408,12 @@
 	Support for the LCD controller integrated in the Marvell
 	Armada XP SoC.
 
+config VIDEO_OMAP3
+	bool "Enable OMAP3+ DSS Support"
+	depends on ARCH_OMAP2PLUS
+	help
+	  This enables the Display subsystem (DSS) on OMAP3+ boards.
+
 config I2C_EDID
 	bool "Enable EDID library"
 	default n