MIPS: PCI: Use PCI Express Capability accessors
MIPS: PCI: Use PCI Express Capability accessors

Use PCI Express Capability access functions to simplify MIPS PCIe code.

Signed-off-by: Jiang Liu <68ee766e574f18b34b683085865827393efe88bd@huawei.com>
Signed-off-by: Bjorn Helgaas <f10ec01be0c6b54271af5c550cd257810bdf3268@google.com>
Acked-by: David Daney <eec15f2dea0e7d114bf41a5bde8a2858b8f3e893@cavium.com>
TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs