[nrf fromtree] drivers: nrf_wifi: Fix the issue of delayed keepalive

Supplicant sends keepalive on timer expiry but due to driver + nRF70
delays it is delayed to the AP, meanwhile some APs disconnect due to
lack of keepalive.

Set the processing delay to 700ms (based on tests) to fix.

Signed-off-by: Chaitanya Tata <[email protected]>
(cherry picked from commit 7fe6930)

Author: krish2718

drivers/wifi/nrf_wifi/src/wpa_supp_if.c

@@ -1807,6 +1807,11 @@ int nrf_wifi_supp_get_capa(void *if_priv, struct wpa_driver_capa *capa)
 		capa->extended_capa_mask = rpu_ctx_zep->extended_capa_mask;
 		capa->extended_capa_len = rpu_ctx_zep->extended_capa_len;
 	}
+	/* Based on testing, this works to fix the disconnection due to delayed
+	 * keepalive to the AP
+	 */
+	capa->driver_tx_processing_delay_ms = 1000;
+
 out:
 	k_mutex_unlock(&vif_ctx_zep->vif_lock);
 	return status;