Add CORDIO label for K64F target in SM example.

Author: pan-

BLE_SM/mbed_app.json

@@ -2,7 +2,7 @@
     "target_overrides": {
         "K64F": {
             "target.features_add": ["BLE"],
-            "target.extra_labels_add": ["ST_BLUENRG"]
+            "target.extra_labels_add": ["ST_BLUENRG", "CORDIO"]
         },
         "NUCLEO_F401RE": {
             "target.features_add": ["BLE"],