Merge pull request #39541 from teto/mptcp_scheduler

linux-mptcp: enable advanced schedulers

pkgs/os-specific/linux/kernel/linux-mptcp.nix

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     DEFAULT_MPTCP_PM default
 
     # MPTCP scheduler selection.
-    # Disabled as the only non-default is the useless round-robin.
-    MPTCP_SCHED_ADVANCED n
+    MPTCP_SCHED_ADVANCED y
     DEFAULT_MPTCP_SCHED default
 
     # Smarter TCP congestion controllers