drm/amd/powerplay: skip soc clk setting under pp one vf

Under sriov pp one vf mode, there is no need to set
soc clk under pp one vf because smu firmware will depend
on the mclk to set the appropriate soc clk for it.

Signed-off-by: Yintian Tao <yttao@amd.com>
Reviewed-by : Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>