drm/amd/pm: support ss metrics read on renoir

add support to read smart shift apu and dgpu power share
on renoir.

Signed-off-by: Sathishkumar S <sathishkumar.sundararaju@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>