pci: do not save 'PCI_BRIDGE_CTL_BUS_RESET'

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8XWDU


CVE: NA

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

When I inject a PCIE Fatal error into a mellanox netdevice, 'dmesg'
shows the device is recovered successfully, but 'lspci' didn't show the
device. I checked the configuration space of the slot where the
netdevice is inserted and found out the bit 'PCI_BRIDGE_CTL_BUS_RESET'
is set. Later, I found out it is because this bit is saved in
'saved_config_space' of 'struct pci_dev' when 'pci_pm_runtime_suspend()'
is called. And 'PCI_BRIDGE_CTL_BUS_RESET' is set every time we restore
the configuration sapce.

This patch avoid saving the bit 'PCI_BRIDGE_CTL_BUS_RESET' when we save
the configuration space of a bridge.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>