drm/amdgpu: more ftrace formatting consistency fixes

Consistent formatting makes it easier to read the logs and apply simple
awk oneliners.

I missed some of these on my last patch.

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>