drm/amd/powerplay: add check for baco support on Arcturus

This is used to determine whether runtime pm can be
supported or not.

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>