LOCAL: mpt_sas: store LED state, expose via ioctl

*** 20,29 ****
--- 20,30 ----
   */
  
  /*
   * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
+  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  
  /*
   * Copyright (c) 2000 to 2010, LSI Corporation.
   * All rights reserved.
*** 206,215 ****
--- 207,217 ----
                  uint16_t                m_qfull_retry_interval;
                  uint8_t                 m_qfull_retries;
                  uint16_t                m_enclosure;
                  uint16_t                m_slot_num;
                  uint32_t                m_tgt_unconfigured;
+                 uint8_t                 m_led_status;
  
                  /*
                   * For the common case, the elements in this structure are
                   * protected by the per hba instance mutex. In order to make
                   * the key code path in ISR lockless, a separate mutex is