V4L/DVB (4706): Do not enable VIDEO_V4L2 unconditionally

The VIDEO_V4L2 config setting is enabled unconditionally, even for 
configurations with no support for this subsystem whatsoever.  The 
following patch adds the necessary dependency.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig
index ed4aa4e..9f7e1fe 100644
--- a/drivers/media/Kconfig
+++ b/drivers/media/Kconfig
@@ -54,6 +54,7 @@
 
 config VIDEO_V4L2
 	bool
+	depends on VIDEO_DEV
 	default y
 
 source "drivers/media/video/Kconfig"