[I/OAT]: Rename cleanup_rbuf to tcp_cleanup_rbuf and make non-static

Needed to be able to call tcp_cleanup_rbuf in tcp_input.c for I/OAT

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index d0c2c2f..578cccf 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -294,6 +294,8 @@
 
 extern void			tcp_rcv_space_adjust(struct sock *sk);
 
+extern void			tcp_cleanup_rbuf(struct sock *sk, int copied);
+
 extern int			tcp_twsk_unique(struct sock *sk,
 						struct sock *sktw, void *twp);