Merge changes I43b8a393,I576be190,Iedc4254e,I0420630f,Ic6aa1f96, ...

* changes:
  Add stack/include/btm_api_types::io_capabilities_text
  Add main/shim/helpers::ToHciRole
  Encapsulate tACL_CONN::role_switch
  Add API tACL_CONN::is_{disconnect/role_switch}_pending
  HACK: Remove SCO disconnect short circuit
  Streamline btif/src/btif_hf::HeadsetInterface::PhoneStateChange
  btm_history: BTM_CreateSco call connecting
  Add stack/btm/btm_sco::GetLegacyHciInterface