drm/amdgpu: enable green_sardine_asd.bin loading (v2)

This patch enable green_sardine_asd.bin loading.

v2: use apu flags

Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>