Revert "drm/amdgpu: simplify ATPX detection"

This reverts commit f5fda6d89a.

You can't use BASE_CLASS in pci_get_class.

Bug: https://gitlab.freedesktop.org/drm/amd/issues/995
Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-12-20 18:57:16 -05:00
commit c00ca07f64