net/ieee802154: remove unused macros to tame gcc

net/ieee802154: remove unused macros to tame gcc

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wpan@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/1604650237-22192-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>