drm/amd/amdgpu: Correct whitespace in GFX v8

Fix various whitespace issues in gfx v8 driver.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>