x86/PCI: MMCONFIG: use pointer to simplify pci_mmcfg_config[] structure access
x86/PCI: MMCONFIG: use pointer to simplify pci_mmcfg_config[] structure access

No functional change, but simplifies a future patch to convert the table
to a list.

Reviewed-by: Yinghai Lu <0674548f4d596393408a51d6287a76ebba2f42aa@kernel.org>
Signed-off-by: Bjorn Helgaas <10beeee9ebfac68af8330145c8378a1d1bb2a283@hp.com>
Signed-off-by: Jesse Barnes <bc7add126c2dbb8382bf1c28ac262b9363a32706@virtuousgeek.org>

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,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas