wl1271: mask aid bits 14 and 15 in ps-poll template

In ps-poll template aid bits 14 and 15 were not masked as required by
the standard. Mask them so that aid is sent in correct format.

This patch is a direct port of the respective patch for the wl1251
driver by Kalle Valo.
Signed-off-by: NJuuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: NVidhya Govindan <vidhya.govindan@nokia.com>
Signed-off-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_cmd.c

@@ -682,7 +682,10 @@ int wl1271_cmd_build_ps_poll(struct wl1271 *wl, u16 aid)
 
 	memcpy(template.bssid, wl->bssid, ETH_ALEN);
 	memcpy(template.ta, wl->mac_addr, ETH_ALEN);
-	template.aid = aid;
+
+	/* aid in PS-Poll has its two MSBs each set to 1 */
+	template.aid = cpu_to_le16(1 << 15 | 1 << 14 | aid);
+
 	template.fc = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);
 
 	return wl1271_cmd_template_set(wl, CMD_TEMPL_PS_POLL, &template,