[OLK-5.10] failed to compile kernel when CONFIG_SMP is not set

当关闭CONFIG_SMP后，编译kernel会有如下错误：
```
kernel/sched/fair.c: In function ‘check_qos_cfs_rq’:
kernel/sched/fair.c:7324:4: error: implicit declaration of function ‘sched_idle_cpu’; did you mean ‘sched_idle_rq’? [-Werror=implicit-function-declaration]                         7324 |   !sched_idle_cpu(smp_processor_id()) &&
      |    ^~~~~~~~~~~~~~
./include/linux/compiler.h:78:42: note: in definition of macro ‘unlikely’
   78 | # define unlikely(x) __builtin_expect(!!(x), 0)
      |                                          ^
  CC      mm/highmem.o
kernel/sched/fair.c: In function ‘pick_next_task_fair’:
kernel/sched/fair.c:7599:43: error: ‘struct rq’ has no member named ‘online’
 7599 |   if (cfs_rq->idle_h_nr_running != 0 && rq->online)
      |                                           ^~
  AR      arch/x86/mm/pat/built-in.a
  CC      kernel/sched/stats.o
kernel/sched/fair.c:7790:7: error: ‘struct rq’ has no member named ‘idle_stamp’; did you mean ‘idle_state’?                                                                         7790 |   rq->idle_stamp = 0;
      |       ^~~~~~~~~~
      |       idle_state
```

复现步骤：
1, cd linux;
2, cp arch/x86/configs/openeuler_defconfig .config
3, make olddefconfig
4, 进入make menuconfig
5, 进入Processor type and features
6, 关闭Symmetric multi-processing support
7, make

GVP openEuler/kernel
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