[media] dvb_usb_v2: use IS_ENABLED() macro

replace:
 #if defined(CONFIG_RC_CORE) || defined(CONFIG_RC_CORE_MODULE)
with:
 #if IS_ENABLED(CONFIG_RC_CORE)

Reported-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/dvb-usb-v2/af9015.c

@@ -1156,7 +1156,7 @@ error:
 	return ret;
 }
 
-#if defined(CONFIG_RC_CORE) || defined(CONFIG_RC_CORE_MODULE)
+#if IS_ENABLED(CONFIG_RC_CORE)
 struct af9015_rc_setup {
 	unsigned int id;
 	char *rc_codes;