V4L/DVB (3933): Add isl6421 module

Driver for the ISL6421 LNB chip

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/frontends/Kconfig b/drivers/media/dvb/frontends/Kconfig
index 64cd636..0ef361f 100644
--- a/drivers/media/dvb/frontends/Kconfig
+++ b/drivers/media/dvb/frontends/Kconfig
@@ -226,4 +226,10 @@
 	help
 	  An SEC control chip.
 
+config DVB_ISL6421
+	tristate "ISL6421 SEC controller"
+	depends on DVB_CORE
+	help
+	  An SEC control chip.
+
 endmenu