batman-adv: Remove unused declarations

Since commit 335fbe0f ("batman-adv: tvlv - convert tt query packet to use tvlv unicast packets")
batadv_recv_tt_query() is not used.
And commit 122edaa0 ("batman-adv: tvlv - convert roaming adv packet to use tvlv unicast packets")
left behind batadv_recv_roam_adv().
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

net/batman-adv/routing.h

@@ -27,10 +27,6 @@ int batadv_recv_frag_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *iface);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
-int batadv_recv_tt_query(struct sk_buff *skb,
-			 struct batadv_hard_iface *recv_if);
-int batadv_recv_roam_adv(struct sk_buff *skb,
-			 struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_tvlv(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,