drm/amdgpu/pm: properly handle sclk for profiling modes on vangogh

When selecting between levels in the force performance levels interface
sclk (gfxclk) was not set correctly for all levels.  Select the proper
sclk settings for all levels.

Bug: drm/amd#1726


Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>