drm/amd/powerplay: update arcturus_ppt.c/h V3

Arcturus ASIC specific powerplay interfaces.

V2: correct SMU msg naming
    drop unnecessary debugs

V3: rebase (Alex)

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>