qcacld-3.0: Remove extern from htt prototypes

To align with the Linux coding standard as enforced by the checkpatch
script, remove the extern keyword from htt prototypes.

Change-Id: I8a935de8d3cb5ea65ee81d5ba770f6e51608cba9
CRs-Fixed: 2411810

core/dp/htt/htt_internal.h

@@ -520,13 +520,13 @@ QDF_STATUS
 htt_h2t_frag_desc_bank_cfg_msg(struct htt_pdev_t *pdev);
 #endif /* defined(HELIUMPLUS) */
 
-extern QDF_STATUS htt_h2t_rx_ring_cfg_msg_ll(struct htt_pdev_t *pdev);
+QDF_STATUS htt_h2t_rx_ring_cfg_msg_ll(struct htt_pdev_t *pdev);
 
-extern QDF_STATUS htt_h2t_rx_ring_rfs_cfg_msg_ll(struct htt_pdev_t *pdev);
+QDF_STATUS htt_h2t_rx_ring_rfs_cfg_msg_ll(struct htt_pdev_t *pdev);
 
-extern QDF_STATUS htt_h2t_rx_ring_rfs_cfg_msg_hl(struct htt_pdev_t *pdev);
+QDF_STATUS htt_h2t_rx_ring_rfs_cfg_msg_hl(struct htt_pdev_t *pdev);
 
-extern QDF_STATUS htt_h2t_rx_ring_cfg_msg_hl(struct htt_pdev_t *pdev);
+QDF_STATUS htt_h2t_rx_ring_cfg_msg_hl(struct htt_pdev_t *pdev);
 
 extern QDF_STATUS (*htt_h2t_rx_ring_cfg_msg)(struct htt_pdev_t *pdev);