drm/amdgpu: drop unused df init callback

It was replaced with the sw_init callback so is no longer
needed.

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-06-21 16:32:25 -05:00
commit f3f48d7331