V4L: radio: Fix error in Kbuild file

All the radio drivers need video_dev, but they were depending on
VIDEO_DEV!=n.  That meant that one could try to compile the driver into
the kernel when VIDEO_DEV=m, which will not work.  If video_dev is a
module, then the radio drivers must be modules too.

(cherry picked from commit b10fece5)
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

drivers/media/radio/Kconfig

@@ -3,7 +3,7 @@
 #
 
 menu "Radio Adapters"
-	depends on VIDEO_DEV!=n
+	depends on VIDEO_DEV
 
 config RADIO_CADET
 	tristate "ADS Cadet AM/FM Tuner"