tcp: Rename tcp_or_dccp_get_hashinfo().

DCCP was removed, so tcp_or_dccp_get_hashinfo() should be renamed.

Let's rename it to tcp_get_hashinfo().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250410023921.11307-5-kuniyu@amazon.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>