Merge changes Idef1560b,I40243c0f,I5c466874,Ie4d1438c,I38a17794, ...

* changes:
  Complete hci legacy interface
  Re-log bta/ag/bta_ag_sco::bta_ag_remove_sco
  Re-log bta/ag/bta_ag_cmd::bta_ag_hfp_result
  Re-log bta/ag/bta_ag_main::bta_ag_api_result
  Add and use tBTM_CB::tACL_CB::Init
  Un-include stack/btm/btm_int
  Properly include stack/test/common/mock_btm_layer
  Use tACL_CONN::SupportsSecureConnections
  Use proper types bta/ag/bta_ag_sco::tBTA_AG_EVT
  Declare stack/gatt/gatt_utils::btm_ble_read_sec_key_size
  Add stack/include/hcidefs::hci_mode_text
  Use btm_client_interface::init,free
  btm_loghistory: HeadsetInterface::PhoneStateChange
  Use inclusive language
  Enum-ify stack/smp/smp_int::tSMP_EVENT,tSMP_BR_EVENT
  Various inclusion stack/::
  Add API btm_client_interface methods
  Declare explicitly global tBTM_CB
  Move stack/include/hcimsgs#defs into ble compilation unit
  Move stack/include/hcimsgs#defs into br_edr compilation unit
  Spell check HCIC_BLE_ENCRYPT_KEY_SIZE