drm/amdgpu: cleanup debugfs handling a bit

Remove the superflous .debugfs_init callback and register all files in
amdgpu_device.c in just one function.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
3 files changed