qcacld-3.0: Remove wlansap_clean_cb() prototype

sap_internal.h currently exports wlansap_clean_cb() but the
implementation of that function is no longer present, so remove the
obsolete prototype.

Change-Id: I850b3de45d27d3d8332278d10714254d93ffd2b3
CRs-Fixed: 2108341

core/sap/src/sap_internal.h

@@ -327,7 +327,6 @@ wlansap_roam_callback
 	uint32_t roamId,
 	eRoamCmdStatus roamStatus, eCsrRoamResult roamResult);
 
-QDF_STATUS wlansap_clean_cb(ptSapContext pSapCtx, uint32_t freeFlag);
 QDF_STATUS SapFsm(ptSapContext sapContext, ptWLAN_SAPEvent sapEvent,
 			 uint8_t *status);