V4L/DVB (8866): Add dummy FE to the Kconfig-file and fix it

Reactivated dummy frontend driver which is extremely useful for debugging.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/frontends/Kconfig b/drivers/media/dvb/frontends/Kconfig
index 774f5c2..e2444f2 100644
--- a/drivers/media/dvb/frontends/Kconfig
+++ b/drivers/media/dvb/frontends/Kconfig
@@ -392,4 +392,10 @@
 	help
 	  A DMB-TH tuner module. Say Y when you want to support this frontend.
 
+comment "Tools to develop new frontends"
+
+config DVB_DUMMY_FE
+	tristate "Dummy frontend driver"
+	default n
+
 endmenu