Intel:PCI/AER: Use for_each_set_bit() to simplify code

mainline inclusion
from mainline-v5.5-rc1
commit 6a8c9734
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V
CVE: NA

--------------------------------

commit 6a8c9734 upstream.
Backport summary: for 4.19 kernel ICX PCIe Gen4 support.

Simplify error counting code by using for_each_set_bit() library function.

Link: https://lore.kernel.org/r/20190827151823.75312-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
(cherry picked from commit 6a8c9734)
Signed-off-by: Ethan Zhao <haifeng.zhao@intel.com>
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>