drm/amd/powerplay: get eclk/vclk/dclk for smu11

Get eclk, vclk and dclk info from vbios when hw init for smu11.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>