drm/amdgpu: fix sdma doorbell comments typo

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Frank.Min <Frank.Min@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Frank.Min 2018-10-02 15:02:09 +08:00 • committed by Alex Deucher
commit c3bce35c66