qcacmn: changes to support lithium nss offload

Changes include
1. nss_cfg parameter to dp_soc.
2. nss_enabled field for pdev.
3. cdp api to enabled nss offload config.
4. skip rx ring configuration when nss enabled.
5. skip timter /interrupt configuration if
   nss is enabled.
6. peer map/unmap event hander.

Change-Id: Ic4a919b6b7e846e18cb15ebcb94f8736a751ecb5

dp/wifi3.0/dp_rx.c

@@ -1188,6 +1188,12 @@ dp_rx_pdev_attach(struct dp_pdev *pdev)
 	struct dp_srng *dp_rxdma_srng;
 	struct rx_desc_pool *rx_desc_pool;
 
+	if (wlan_cfg_get_dp_pdev_nss_enabled(pdev->wlan_cfg_ctx)) {
+		QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_ERROR,
+			"nss-wifi<4> skip Rx refil %d", pdev_id);
+		return QDF_STATUS_SUCCESS;
+	}
+
 	qdf_spinlock_create(&soc->rx_desc_mutex[pdev_id]);
 	pdev = soc->pdev_list[pdev_id];
 	rxdma_srng = pdev->rx_refill_buf_ring;