drivers/base/arch_topology.c: remove superfluous header

arch_topology.c hasn't use any macro or function declared in linux/percpu.h,
linux/smp.h and linux/string.h.
Thus, these files can be removed from arch_topology.c safely without
affecting the compilation of the drivers/base/ module
Signed-off-by: Mianhan Liu <liumh1@shanghaitech.edu.cn>
Link: https://lore.kernel.org/r/20210928193138.24192-1-liumh1@shanghaitech.edu.cnSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/arch_topology.c

@@ -12,15 +12,12 @@
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/slab.h>
-#include <linux/string.h>
 #include <linux/sched/topology.h>
 #include <linux/cpuset.h>
 #include <linux/cpumask.h>
 #include <linux/init.h>
-#include <linux/percpu.h>
 #include <linux/rcupdate.h>
 #include <linux/sched.h>
-#include <linux/smp.h>
 
 static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
 static struct cpumask scale_freq_counters_mask;