drm/amd/pm: add missing ->fini_xxxx interfaces for some SMU13 asics

Without these, potential memory leak may be induced.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>