Some asics still support non-atomic code paths.

Fixes: 66f99628 ("drm/amdgpu: use dirty framebuffer helper")
Reported-by: NArthur Marsh <arthur.marsh@internode.on.net>
Reviewed-by: NHamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>