drm/amdgpu: add psp support for raven2

Modified for using raven2_asd.bin to replace raven_asd.bin for raven2

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>