[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/cxd2820r.h b/drivers/media/dvb-frontends/cxd2820r.h
index 6acc21c..82b3d93 100644
--- a/drivers/media/dvb-frontends/cxd2820r.h
+++ b/drivers/media/dvb-frontends/cxd2820r.h
@@ -22,6 +22,7 @@
 #ifndef CXD2820R_H
 #define CXD2820R_H
 
+#include <linux/kconfig.h>
 #include <linux/dvb/frontend.h>
 
 #define CXD2820R_GPIO_D (0 << 0) /* disable */
@@ -65,8 +66,7 @@
 };
 
 
-#if defined(CONFIG_DVB_CXD2820R) || \
-	(defined(CONFIG_DVB_CXD2820R_MODULE) && defined(MODULE))
+#if IS_ENABLED(CONFIG_DVB_CXD2820R)
 extern struct dvb_frontend *cxd2820r_attach(
 	const struct cxd2820r_config *config,
 	struct i2c_adapter *i2c,