[media] dvb-frontends: use IS_ENABLED

Instead of checking everywhere there for 3 symbols, use instead
IS_ENABLED macro.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb-frontends/ec100.h b/drivers/media/dvb-frontends/ec100.h
index b847971..3755840 100644
--- a/drivers/media/dvb-frontends/ec100.h
+++ b/drivers/media/dvb-frontends/ec100.h
@@ -22,6 +22,7 @@
 #ifndef EC100_H
 #define EC100_H
 
+#include <linux/kconfig.h>
 #include <linux/dvb/frontend.h>
 
 struct ec100_config {
@@ -30,8 +31,7 @@
 };
 
 
-#if defined(CONFIG_DVB_EC100) || \
-	(defined(CONFIG_DVB_EC100_MODULE) && defined(MODULE))
+#if IS_ENABLED(CONFIG_DVB_EC100)
 extern struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 	struct i2c_adapter *i2c);
 #else