drm/amdgpu/gfx9: rework lbpw enable code

To avoid changing the global lbpw module parameter directly.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2018-11-08 16:34:48 -05:00
commit 688be01a0a