Merge branch 'master' into master

Author: pan-

BLE_SM/README.md

@@ -26,4 +26,4 @@ Hardware requirements are in the [main readme](https://github.com/ARMmbed/mbed-o
 
 Building instructions for all samples are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
 
-Note: example currently doesn't use ST provided stack and instead uses a Cordio port for the ST.
+Note: this example currently is currently not supported on ST BLUENRG targets.

BLE_SM/mbed_app.json

@@ -1,16 +1,2 @@
 {
-    "target_overrides": {
-        "K64F": {
-            "target.features_add": ["BLE"],
-            "target.extra_labels_add": ["ST_BLUENRG", "CORDIO"]
-        },
-        "NUCLEO_F401RE": {
-            "target.features_add": ["BLE"],
-            "target.extra_labels_add": ["ST_BLUENRG", "CORDIO"]
-        },
-        "DISCO_L475VG_IOT01A": {
-            "target.features_add": ["BLE"],
-            "target.extra_labels_add": ["ST_BLUENRG", "CORDIO"]
-        }
-    }
 }