qcacmn: Correct the offsets & byte cnt computation in HTT stats

Offsets used by host for HTT stats are not aligned as per the
structure declaration given in file htt.h .
Make change to use the correct offsets to get the correct stats.

Also make change for byte count computation.

Also make cleanup changes for FR65817.

Change-Id: I8bc6164cc4994c49536d7277779f25b258be1592
CRs-Fixed: 3082742

wlan_cfg/wlan_cfg.h

@@ -1954,6 +1954,18 @@ void
 wlan_cfg_set_rx_rel_ring_id(struct wlan_cfg_dp_soc_ctxt *cfg,
 			    uint8_t wbm2sw_ring_id);
 
+/**
+ * wlan_cfg_set_vdev_stats_hw_offload_config() - Set hw vdev stats offload
+ *						 config
+ * @cfg: config context
+ * @value: value to be set
+ *
+ * Return: none
+ */
+void
+wlan_cfg_set_vdev_stats_hw_offload_config(struct wlan_cfg_dp_soc_ctxt *cfg,
+					  bool value);
+
 /**
  * wlan_cfg_get_vdev_stats_hw_offload_config() - Get hw vdev stats offload
  *						 config