mac80211: remove ieee80211_get_key_tx_seq/ieee80211_set_key_tx_seq

Since the PNs of all the tx keys are now tracked in the public
part of the key struct (with atomic counter), we no longer
need these functions.

dvm and vt665{5,6} are currently the only users of these functions,
so update them accordingly.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/staging/vt6656/rxtx.c b/drivers/staging/vt6656/rxtx.c
index efb54f5..76378d2 100644
--- a/drivers/staging/vt6656/rxtx.c
+++ b/drivers/staging/vt6656/rxtx.c
@@ -719,7 +719,7 @@
 	u16 payload_len, struct vnt_mic_hdr *mic_hdr)
 {
 	struct ieee80211_hdr *hdr = tx_context->hdr;
-	struct ieee80211_key_seq seq;
+	u64 pn64;
 	u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 
 	/* strip header and icv len from payload */
@@ -752,9 +752,13 @@
 		mic_hdr->payload_len = cpu_to_be16(payload_len);
 		ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 
-		ieee80211_get_key_tx_seq(tx_key, &seq);
-
-		memcpy(mic_hdr->ccmp_pn, seq.ccmp.pn, IEEE80211_CCMP_PN_LEN);
+		pn64 = atomic64_read(&tx_key->tx_pn);
+		mic_hdr->ccmp_pn[5] = pn64;
+		mic_hdr->ccmp_pn[4] = pn64 >> 8;
+		mic_hdr->ccmp_pn[3] = pn64 >> 16;
+		mic_hdr->ccmp_pn[2] = pn64 >> 24;
+		mic_hdr->ccmp_pn[1] = pn64 >> 32;
+		mic_hdr->ccmp_pn[0] = pn64 >> 40;
 
 		if (ieee80211_has_a4(hdr->frame_control))
 			mic_hdr->hlen = cpu_to_be16(28);