The mlme_sap_set_twt_command_in_progress() prototype was added as part
of the following patch:
qcacld-3.0: Add support for SAP TWT teardown
Change-Id I108ea425e69e07ee8a3657ca5afcb436420b2626
However, there isn't an actual implementation of this function, so
remove the unused prototype.
Change-Id: If30d4e53b69c7747d60974c06a91795caffd19c0
CRs-Fixed: 3430387