Revert "Revert "seqlock: lockdep assert non-preemptibility on seqcount_t write""

This reverts commit 5e9203d8.

It should now be fixed up properly in Linus's tree, so revert this
revert to clear up any merge issues with the "real" fix that is
happening upstream.

Link: https://lore.kernel.org/r/87v9hqxolz.fsf@nanos


Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I57c6a5777befa560af8e89ff708a1be4eb46cb33