Merge branch 'mptcp-fixes-and-tracepoints'

Mat Martineau says:

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mptcp: Fixes and tracepoints from the mptcp tree

Here's one more batch of changes that we've tested out in the MPTCP tree.

Patch 1 makes the MPTCP KUnit config symbol more consistent with other
subsystems.

Patch 2 fixes a couple of format specifiers in pr_debug()s

Patches 3-7 add four helpful tracepoints for MPTCP.

Patch 8 is a one-line refactor to use an available helper macro.
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Signed-off-by: David S. Miller <davem@davemloft.net>