mac802154: introduce hw_to_local function

This patch replace the mac802154_to_priv macro with a static inline
function named hw_to_local. This brings a similar naming convention like
mac80211 stack.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index b6039c7..3684426 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -88,7 +88,7 @@
 		goto err_tx;
 	}
 
-	mac802154_monitors_rx(mac802154_to_priv(&local->hw), skb);
+	mac802154_monitors_rx(local, skb);
 
 	if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
 		u16 crc = crc_ccitt(0, skb->data, skb->len);