add implicit call to preserve state on reset

connectivity/FEATURE_BLE/include/ble/SecurityManager.h

@@ -514,8 +514,7 @@ public:
      * Some or all of bonding information may be stored in memory while in use. This will write
      * bonding data to persistent storage. This will have no effect if no persistent storage is enabled.
      *
-     * @note You still need to call preserveBondingStateOnReset(true) before reset happens for data to be
-     * loaded when it's read.
+     * @note This implicitly also calls preserveBondingStateOnReset(true) inside.
      *
      * @note Depending on the driver used to implement the storage solution used this may be a disruptive
      * operation and may cause active connections to drop due to failed processing deadlines.

connectivity/FEATURE_BLE/source/SecurityManager.cpp

@@ -49,6 +49,10 @@ ble_error_t SecurityManager::preserveBondingStateOnReset(bool enable)
 
 ble_error_t SecurityManager::writeBondingStateToPersistentStorage()
 {
+    ble_error_t err = impl->preserveBondingStateOnReset(true);
+    if (err) {
+        return err;
+    }
     return impl->writeBondingStateToPersistentStorage();
 }