rcutorture: Make rcu_torture_fakewriter() use blocking wait primitives

Full testing of the new SRCU polling API requires that the fake
writers also use it in order to test concurrent calls to all of the API
members, especially start_poll_synchronize_srcu().  This commit makes
rcu_torture_fakewriter() use all available blocking grace-period-wait
primitives available from the RCU flavor under test.

Link: https://lore.kernel.org/rcu/[email protected]/
Reported-by: Kent Overstreet <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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