drm/amd/pm: add PrepareMp1ForUnload support for yellow carp

Driver needs to notify the PMFW when the RLC is disabled.

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