OMAPDSS: panel-dvi: Add Kconfig dependency on I2C

panel-dvi uses i2c, but the Kconfig didn't have dependency on I2C. Add
it.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/omap2/displays/Kconfig b/drivers/video/omap2/displays/Kconfig
index 74d29b5..408a992 100644
--- a/drivers/video/omap2/displays/Kconfig
+++ b/drivers/video/omap2/displays/Kconfig
@@ -12,7 +12,7 @@
 
 config PANEL_DVI
 	tristate "DVI output"
-	depends on OMAP2_DSS_DPI
+	depends on OMAP2_DSS_DPI && I2C
 	help
 	  Driver for external monitors, connected via DVI. The driver uses i2c
 	  to read EDID information from the monitor.