drm/amdgpu/powerplay/raven: add smu block and enable powerplay

Add the ip block and enable powerplay on raven.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>