tcp: remove tcp_send_partial()

This function does not exist.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230718161620.1391951-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/tcp.h

@@ -606,7 +606,6 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
 		 unsigned int mss_now, gfp_t gfp);
 
 void tcp_send_probe0(struct sock *);
-void tcp_send_partial(struct sock *);
 int tcp_write_wakeup(struct sock *, int mib);
 void tcp_send_fin(struct sock *sk);
 void tcp_send_active_reset(struct sock *sk, gfp_t priority);