[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/drxd.h b/drivers/media/dvb-frontends/drxd.h
index 216c8c3..5f1d6b5 100644
--- a/drivers/media/dvb-frontends/drxd.h
+++ b/drivers/media/dvb-frontends/drxd.h
@@ -24,6 +24,7 @@
 #ifndef _DRXD_H_
 #define _DRXD_H_
 
+#include <linux/kconfig.h>
 #include <linux/types.h>
 #include <linux/i2c.h>
 
@@ -51,8 +52,7 @@
 	 s16(*osc_deviation) (void *priv, s16 dev, int flag);
 };
 
-#if defined(CONFIG_DVB_DRXD) || \
-			(defined(CONFIG_DVB_DRXD_MODULE) && defined(MODULE))
+#if IS_ENABLED(CONFIG_DVB_DRXD)
 extern
 struct dvb_frontend *drxd_attach(const struct drxd_config *config,
 				 void *priv, struct i2c_adapter *i2c,