Merge changes I9c6cce21,I808a6fd2,I263e4cfd,I522fcfa3,I6abb2319, ...

* changes:
  Remove unused stack/btm/btm_ble_int_types::tINQ_LE_BDADDR
  Remove constant var tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::scan_duplicate_filter
  Remove never-set vars tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::
  Add Api tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::adv_mode
  Remove unused vars tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB
  Expand clever stack/btm/btm_ble_gap::btm_set_conn_mode_adv_init_addr
  Remove tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::tx_power
  Remove unused vars tBTM_CB::tBTM_BLE_CB::tBTM_LE_RANDOM_CB
  Remove never-set var tBTM_CB::tBTM_BLE_CB::mixed_mode
  Const-ify size tBTM_CB::tBTM_BLE_CB::link_count[]
  Remove unused var tBTM_CB::tBTM_BLE_CB::enabled
  Add Api around tBTM_CB::paging
  Remove tBTM_CB::discing can never be true