btm_sec_save_le_key() function

* Function btm_sec_save_le_key * Description This function is called by the SMP to update * an BLE key. SMP is internal, whereas all the keys shall * be sent to the application. The function is also called * when application passes ble key stored in NVRAM to the btm_sec. * pass_to_application parameter is false in this case. * Returns void