qcacld-3.0: Remove wlan_hdd_roc_request_dequeue() prototype

Previously change Idaaacac4fdaf1b964432c33c10b1c86f8a591c2d
("qcacld-3.0: Remove legacy P2P codes in HDD") removed function
wlan_hdd_roc_request_dequeue() but did not remove the prototype, so
remove it now.

Change-Id: Ic2eb217b3974b274e890c1c556eece9e688463b4
CRs-Fixed: 2362719

core/hdd/inc/wlan_hdd_p2p.h

@@ -108,8 +108,6 @@ int __wlan_hdd_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev);
 
 void wlan_hdd_cleanup_remain_on_channel_ctx(struct hdd_adapter *adapter);
 
-void wlan_hdd_roc_request_dequeue(struct work_struct *work);
-
 /**
  * wlan_hdd_set_power_save() - hdd set power save
  * @adapter:    adapter context