Merge changes Iccb0a4b6,I04a65e1c,Iadb4a68c,Ia6366db2,I81a5f03c, ...

* changes:
  Remove unused file bta/include/bta_gatts_co.h
  Remove unused api bta_gatts_co_srv_chg
  Remove unused bta_gatts_co_srv_chg
  Remove unused bta_gatts_co_load_handle_range
  Add API check_cod_hid
  Add API is_main_thread() check
  Fix gatt_disconnection_reason_text