timers: Mark racy updates to hlist_node::pprev field

hlist_unhashed_lockless() locklessly samples the hlist_node structure's
pprev field, but detach_timer(), hlist_move_list(), and hlist_splice_init()
all use plain C-language stores to update this field, despite the "The
READ_ONCE() is paired with the various WRITE_ONCE() in hlist helpers that
are defined below" in the hlist_unhashed_lockless() header comment.

Therefore use WRITE_ONCE() for these hlist_node::pprev updates.

KCSAN located this issue.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260919002523.3133928-1-paulmck@kernel.org

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