Merge branch 'mptcp-updates-for-net-next'

Mat Martineau says:

====================
mptcp: Updates for net-next

Three independent fixes/features from the MPTCP tree:

Patch 1 is a selftest workaround for older iproute2 packages.

Patch 2 removes superfluous locks that were added with recent MP_FAIL
patches.

Patch 3 adds support for the TCP_DEFER_ACCEPT sockopt.
====================

Link: https://lore.kernel.org/r/20220514002115.725976-1-mathew.j.martineau@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>