Keep SHCI for unsupported Radio Stack (#960)

* bt: don't stop shci on wrong stack. Start radios stack if FUS is running
* bt: code clean up, f6 target sync

Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/f7/ble_glue/ble_glue.h

@@ -43,8 +43,15 @@ void ble_glue_set_key_storage_changed_callback(
     BleGlueKeyStorageChangedCallback callback,
     void* context);
 
+/** Stop SHCI thread */
 void ble_glue_thread_stop();
 
+/** Restart MCU to launch radio stack firmware if necessary
+ *
+ * @return      true on radio stack start command
+ */
+bool ble_glue_radio_stack_fw_launch_started();
+
 #ifdef __cplusplus
 }
 #endif