drm/radeon: use pcie_get_readrq() and pcie_set_readrq() to simplify code
Use pcie_get_readrq() and pcie_set_readrq() functions to simplify code. Signed-off-by: NYijing Wang <wangyijing@huawei.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
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