[nrf noup] zephyr: Revert DHCP workaround

fixup! [nrf noup] zephyr: Add support for Zephyr RTOS

The underlying issue of ADDBA handling is fixed in UMAC, so, remove the
workaround.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

wpa_supplicant/wpa_supplicant.c

@@ -915,28 +915,6 @@ void wpa_supplicant_reinit_autoscan(struct wpa_supplicant *wpa_s)
 	}
 }
 
-// TODO: This WAR is needed as we always lose the first frame after association (DHCP),
-// and IP assignment gets delayed (esp. with exponential backoff in Zephyr DHCP client), so
-// we send out a dummy frame that will be lost, and then DHCP will go through smoothly.
-//
-// Remove this once the first frame issue is fixed.
-static void dhcp_war(struct wpa_supplicant *wpa_s)
-{
-       int len = 30, res = -1;
-       char *buf;
-
-       buf = os_malloc(len);
-       if (buf == NULL)
-               return;
-
-       memset(buf, 0xAA, len);
-
-       res = l2_packet_send(wpa_s->l2, wpa_s->bssid, ntohs(0x8989), buf, len);
-       wpa_printf(MSG_DEBUG, "DHCP WAR: TX frame res=%d", res);
-       os_free(buf);
-}
-
-
 /**
  * wpa_supplicant_set_state - Set current connection state
  * @wpa_s: Pointer to wpa_supplicant data
@@ -1043,7 +1021,6 @@ void wpa_supplicant_set_state(struct wpa_supplicant *wpa_s,
 		wpa_s->after_wps = 0;
 		wpa_s->known_wps_freq = 0;
 		wpas_p2p_completed(wpa_s);
-		dhcp_war(wpa_s);
 
 		sme_sched_obss_scan(wpa_s, 1);