Merge branch 'tcp-clean-up-syn-ack-rto-code-and-apply-max-rto'

Kuniyuki Iwashima says:

====================
tcp: Clean up SYN+ACK RTO code and apply max RTO.

Patch 1 - 4 are misc cleanup.

Patch 5 applies max RTO to non-TFO SYN+ACK.

Patch 6 adds a test for max RTO of SYN+ACK.
====================

Link: https://patch.msgid.link/20251106003357.273403-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>