qcacmn: Use CONFIG_SAWF macro for enabling HW Tx Delay

Use CONFIG_SAWF macro to prevent linking dp_set_delta_tsf in
low memory profile.

Change-Id: I07b75f893e6d043839225d9b7288823b6ef2f823
CRs-Fixed: 3211426

dp/inc/cdp_txrx_ctrl.h

@@ -1321,7 +1321,7 @@ void cdp_txrx_peer_flush_frags(ol_txrx_soc_handle soc, uint8_t vdev_id,
 							 peer_mac);
 }
 
-#if defined(WLAN_FEATURE_TSF_UPLINK_DELAY) || defined(QCA_PEER_EXT_STATS)
+#if defined(WLAN_FEATURE_TSF_UPLINK_DELAY) || defined(CONFIG_SAWF)
 /**
  * cdp_set_delta_tsf() - wrapper function to set delta_tsf
  * @soc: SOC TXRX handle