KVM/PPC/Book3S HV: Use cpuhp_setup_state_nocalls_cpuslocked()

kvmppc_alloc_host_rm_ops() holds get_online_cpus() while invoking
cpuhp_setup_state_nocalls().

cpuhp_setup_state_nocalls() invokes get_online_cpus() as well. This is
correct, but prevents the conversion of the hotplug locking to a percpu
rwsem.

Use cpuhp_setup_state_nocalls_cpuslocked() to avoid the nested
call. Convert *_online_cpus() to the new interfaces while at it.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: [email protected]
Cc: Peter Zijlstra <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: [email protected]
Cc: Michael Ellerman <[email protected]>
Cc: [email protected]
Cc: Alexander Graf <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]

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