PCI/pciehp: Use PCI Express Capability accessors
Use PCI Express Capability access functions to simplify pciehp. Signed-off-by: NJiang Liu <jiang.liu@huawei.com> Signed-off-by: NYijing Wang <wangyijing@huawei.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
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