qcacld-3.0: fix compilation issue with dp_rx_napi_gro_flush

If CONFIG_WLAN_FEATURE_DP_RX_THREADS is not defined then
dp_rx_napi_gro_flush function will not get compiled from
dp_rx_thread.c, report compilation failure.

Modify dp_rx_napi_gro_flush to static inline type out of
dp_rx_thread.c.

Change-Id: Iad7619e29f6175bc80f2618b3675feafd7f3260d
CRs-Fixed: 2732503

core/dp/txrx3.0/dp_rx_thread.c

@@ -953,17 +953,3 @@ QDF_STATUS dp_rx_tm_set_cpu_mask(struct dp_rx_tm_handle *rx_tm_hdl,
 	}
 	return QDF_STATUS_SUCCESS;
 }
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0))
-void dp_rx_napi_gro_flush(struct napi_struct *napi)
-{
-	if (napi->poll) {
-		napi_gro_flush(napi, false);
-		if (napi->rx_count) {
-			netif_receive_skb_list(&napi->rx_list);
-			qdf_init_list_head(&napi->rx_list);
-			napi->rx_count = 0;
-		}
-	}
-}
-#endif

core/dp/txrx3.0/dp_txrx.h

@@ -56,7 +56,17 @@ struct dp_txrx_handle {
  *
  * return: none
  */
-void dp_rx_napi_gro_flush(struct napi_struct *napi);
+static inline void dp_rx_napi_gro_flush(struct napi_struct *napi)
+{
+	if (napi->poll) {
+		napi_gro_flush(napi, false);
+		if (napi->rx_count) {
+			netif_receive_skb_list(&napi->rx_list);
+			qdf_init_list_head(&napi->rx_list);
+			napi->rx_count = 0;
+		}
+	}
+}
 #else
 #define dp_rx_napi_gro_flush(_napi) napi_gro_flush((_napi), false)
 #endif