qcacmn: Fix wrong rssi in monitor mode

If ppdu rssi unit is dbm, need convert to db for API:
qdf_nbuf_update_radiotap, only need convert once for first mdpu in the
ppdu. if convert for each mpdu, wrong rssi will be saved.

Change-Id: I85e92121ddb289e3513022ff092083825197efb4
CRs-Fixed: 3057041

dp/wifi3.0/monitor/dp_rx_mon.h

@@ -581,28 +581,6 @@ dp_cfr_rcc_mode_status(struct dp_pdev *pdev)
 }
 #endif /* WLAN_CFR_ENABLE && WLAN_ENH_CFR_ENABLE */
 
-
-#ifdef DP_MON_RSSI_IN_DBM
-/*
- * dp_rx_mon_rssi_convert(): convert rssi_comb from unit dBm to dB
- * to match with radiotap further conversion requirement
- * @rx_status: monitor mode rx status pointer
- *
- * Return: none
- */
-static inline
-void dp_rx_mon_rssi_convert(struct mon_rx_status *rx_status)
-{
-	rx_status->rssi_comb = rx_status->rssi_comb -
-			rx_status->chan_noise_floor;
-}
-#else
-static inline
-void dp_rx_mon_rssi_convert(struct mon_rx_status *rx_status)
-{
-}
-#endif
-
 /*
  * dp_rx_mon_deliver(): function to deliver packets to stack
  * @soc: DP soc