[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/lgs8gl5.h b/drivers/media/dvb-frontends/lgs8gl5.h
index d1417678..c2da596 100644
--- a/drivers/media/dvb-frontends/lgs8gl5.h
+++ b/drivers/media/dvb-frontends/lgs8gl5.h
@@ -23,6 +23,7 @@
 #ifndef LGS8GL5_H
 #define LGS8GL5_H
 
+#include <linux/kconfig.h>
 #include <linux/dvb/frontend.h>
 
 struct lgs8gl5_config {
@@ -30,8 +31,7 @@
 	u8 demod_address;
 };
 
-#if defined(CONFIG_DVB_LGS8GL5) || \
-	(defined(CONFIG_DVB_LGS8GL5_MODULE) && defined(MODULE))
+#if IS_ENABLED(CONFIG_DVB_LGS8GL5)
 extern struct dvb_frontend *lgs8gl5_attach(
 	const struct lgs8gl5_config *config, struct i2c_adapter *i2c);
 #else