drm/amd/powerplay: added new se_cac_idx r/w APIs v2

  - v2: added missing spinlock init

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>
2 files changed