tcp: Agile-SD: make it work for 4.14

(cherry picked from commit b8b22fc91b33bb5edaaa020fa8b6e322d5036bd3)
(cherry picked from commit 29fcd70b5a2164ee26f0015e2822fe4c24037a58)
(cherry picked from commit ba77388a8b561deb4fc05004d1f675051fd5c9ee)
(cherry picked from commit 879541c0759f3a9451f627d2e5890a041f9320dd)
(cherry picked from commit 805242345941b86212bd7d84340bbd9f78c3f941)
(cherry picked from commit 6d6064f323da20854846c19307ec01a03c35ed6d)
(cherry picked from commit 0e3f6ec246d2b3f97d970445cf83572d40b2a557)
(cherry picked from commit e50bbc96c92c3b906339b418e19ab53b8677beac)
(cherry picked from commit fc9f776f2dbaf606f8eef1b069ea013535fded6f)

net/ipv4/tcp_agilesd.c

@@ -155,7 +155,7 @@ static void agilesdtcp_state(struct sock *sk, u8 new_state)
 
 /* This function is called when there is an acknowledgment that acknowledges some new packets.
  * num_acked is the number of packets that are acknowledged by this acknowledgments. */
-static void agilesdtcp_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
+static void agilesdtcp_acked(struct sock *sk, const struct ack_sample *sample)
 {
 
 }