qcacld-3.0: Remove wma_scan_event_callback() prototype

Change Ibeb6f99335b4e745335d5968791d9e9187df47f7 ("qcacld-3.0: Remove
legacy scan event handling") removed the implementation of function
wma_scan_event_callback(). However the prototype was left behind, so
remove it now.

Change-Id: I34cd7fa0e9d28c10d73f1000284148eaece042f5
CRs-Fixed: 2379063

core/wma/inc/wma_internal.h

@@ -488,8 +488,6 @@ wma_reset_passpoint_network_list(tp_wma_handle wma,
 
 QDF_STATUS wma_scan_probe_setoui(tp_wma_handle wma, tSirScanMacOui *psetoui);
 
-int wma_scan_event_callback(WMA_HANDLE handle, uint8_t *data, uint32_t len);
-
 void wma_roam_better_ap_handler(tp_wma_handle wma, uint32_t vdev_id);
 
 int wma_roam_event_callback(WMA_HANDLE handle, uint8_t *event_buf,