hwmon: ({core, pkg, via-cpu}temp) remove unnecessary CONFIG_HOTPLUG_CPU ifdefs

CONFIG_HOTPLUG_CPU is used too much in some drivers.
This patch clean them up.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index b4aea20..467488c 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -566,9 +566,8 @@
 static void __exit coretemp_exit(void)
 {
 	struct pdev_entry *p, *n;
-#ifdef CONFIG_HOTPLUG_CPU
+
 	unregister_hotcpu_notifier(&coretemp_cpu_notifier);
-#endif
 	mutex_lock(&pdev_list_mutex);
 	list_for_each_entry_safe(p, n, &pdev_list, list) {
 		platform_device_unregister(p->pdev);