For vega20, there are two UVD rings which share one powerplay instance.
Under some case(two rings used parallel), the uvd dpm is disabled twice
which causes the SMC hang.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Rex Zhu <rezhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>