cpu/hotplug: Fix kernel doc warnings for __cpuhp_setup_state_cpuslocked()

Fixes the following W=1 kernel build warning(s):

 kernel/cpu.c:1949: warning: Function parameter or member 
  'name' not described in '__cpuhp_setup_state_cpuslocked'
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210605063003.681049-1-libaokun1@huawei.com

kernel/cpu.c

@@ -1976,6 +1976,7 @@ EXPORT_SYMBOL_GPL(__cpuhp_state_add_instance);
 /**
  * __cpuhp_setup_state_cpuslocked - Setup the callbacks for an hotplug machine state
  * @state:		The state to setup
+ * @name:		Name of the step
  * @invoke:		If true, the startup function is invoked for cpus where
  *			cpu state >= @state
  * @startup:		startup callback function