LoongArch: fix compile error when using make allmodconfig

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6LL93



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1. when compiling at arm32 using make allmodconfig,error occurred
  caused by no including the required header file, so force to
  include the required file.
2. fix drivers/vfio/pci/vfio_pci_rdwr.c compile error on LoongArch

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>