cpu/hotplug: Add __cpuhp_state_add_instance_cpuslocked()

cpu/hotplug: Add __cpuhp_state_add_instance_cpuslocked()

Add cpuslocked() variants for the multi instance registration so this can
be called from a cpus_read_lock() protected region.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170524081547.321782217@linutronix.de