Merge branch 'tcp-remove-tcp_rate-c'

Eric Dumazet says:

====================
tcp: remove tcp_rate.c

Move tcp_rate_gen() to tcp_input.c and tcp_rate_check_app_limited()
to tcp.c for better code generation.

tcp_rate.c was interesting from code maintenance perspective
but was adding cpu costs.
====================

Link: https://patch.msgid.link/20260121095923.3134639-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>