atomic debugfs files not created

[Drew Davenport]

I was doing some debugging and found that /sys/kernel/debug/dri/0/state
doesn't get created for amdgpu. After a bit of digging around I found that
the DRIVER_ATOMIC feature flag gets set in dm_early_init in amdgpu_dm.c,
which is run after drm_debugfs_init where the atomic debugfs files would
have been created.

I tried moving DRIVER_ATOMIC to the rest of the kms_driver.driver_feature
flags in amdgpu_drv.c, and this allowed the debugfs to get created as
expected. Nothing seemed terribly broken, but I didn't test thoroughly.

Is there any reason not to move DRIVER_ATOMIC to the rest of the feature
flags? Thanks.
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