drm/amdgpu: Remove redundant check for async_gfx_ring
Remove the redundant check for async_gfx_ring,
as it is not required for gfx v12_1
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
authored by