powerpc/qspinlock: stop queued waiters trying to set lock sleepy

If a queued waiter notices the lock owner or the previous waiter has
been preempted, it attempts to mark the lock sleepy, but it does this
as a try-set operation using the original lock value it got when
queueing, which will become stale as the queue progresses, and the
try-set will fail. Drop this and just set the sleepy seen clock.

Signed-off-by: Nicholas Piggin <[email protected]>
Tested-by: Shrikanth Hegde <[email protected]>
Reviewed-by: "Nysal Jan K.A" <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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