drm/amd/powerplay: update vega20 clocks threshold settings on power state adjust

UVD, VCE and SOC clocks need to be taken into consideration. Also, the
thresholds need be updated correspondingly when stable power state is selected.

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