qcacld-3.0: Remove eSAP_ASSOC_STA_CALLBACK_EVENT handling

Change Iea602a1da42d5eecafae1d00f2260f4930128f40 ("qcacld-3.0: Remove
eWNI_SME_GET_ASSOC_STAS_REQ handling") removed the logic that sent the
eSAP_ASSOC_STA_CALLBACK_EVENT event. Since this event is obsolete,
remove the handling code from SAP and HDD.

Change-Id: I49e169a1832845bac4e89cd832d72dec42d4ee09
CRs-Fixed: 2396058
3 files changed