regression on RV1

[StDenis, Tom]

This commit:

commit 6cbd074831a423e0d30b386fc056d6c2c3559147 (HEAD, refs/bisect/bad)
Author: Christian König <christian.koenig at amd.com>
Date:   Mon Oct 8 14:38:22 2018 +0200

     drm/amdgpu: activate paging queue on SDMA v4

     Implement all the necessary stuff to get those extra rings working.

     Signed-off-by: Christian König <christian.koenig at amd.com>
     Reviewed-by: Huang Rui <ray.huang at amd.com>

Breaks my RV1 init.

Tom
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