brcmfmac: Remove sleep on del_station.

Currently there is a sleep after disconnect on del_station. This
timeout is not needed (anymore) and is causing problems with p2p
setup, because remote side disconnects then supplicant will do
del_station and while it waits the 400ms remote side will already
reconnect and that is something supplicant cant handle.
Reviewed-by: NArend Van Spriel <arend@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: NPiotr Haber <phaber@broadcom.com>
Signed-off-by: NHante Meuleman <meuleman@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c

@@ -3895,12 +3895,7 @@ brcmf_cfg80211_del_station(struct wiphy *wiphy, struct net_device *ndev,
 				     &scbval, sizeof(scbval));
 	if (err)
 		brcmf_err("SCB_DEAUTHENTICATE_FOR_REASON failed %d\n", err);
-	/*
-	 * Wait for the deauth event to come, supplicant will do the
-	 * delete iface immediately and we will have problem in sending
-	 * deauth frame if we delete the bss in firmware
-	 */
-	brcmf_delay(400);
+
 	brcmf_dbg(TRACE, "Exit\n");
 	return err;
 }