[TCP] Move tcp_get_info out of tcp_diag

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

In my recent foray into tcp_diag I discovered some ugly looking ifdef's
on CONFIG_IPV6 that'll break when IPv6 is built as a module.  In order
to fix it, we need to allow tcp_diag to be built as a module.

So here is a start.  This patch move tcp_get_info from tcp_diag.c into
the site of the other caller, tcp.c.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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