drm/amdgpu: Prefer pcie_capability_read_word()

[ Upstream commit 88027c89ea146e32485251f1c2dddcde43c8d04e ]

Commit 8c0d3a02 ("PCI: Add accessors for PCI Express Capability")
added accessors for the PCI Express Capability so that drivers didn't
need to be aware of differences between v1 and v2 of the PCI
Express Capability.

Replace pci_read_config_word() and pci_write_config_word() calls with
pcie_capability_read_word() and pcie_capability_write_word().

[bhelgaas: fix a couple remaining instances in cik.c]
Link: https://lore.kernel.org/r/20191118003513.10852-1-fred@fredlawl.com


Signed-off-by: Frederick Lawler <fred@fredlawl.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: ce7d88110b9e ("drm/amdgpu: Use RMW accessors for changing LNKCTL")
Signed-off-by: Sasha Levin <sashal@kernel.org>