drm/amdgpu: add cp/rlc fw loading support for cyan_skillfish

Add cp/rlc fw loading support and gfx golden setting.

v2: squash in updates (Alex)

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>