drm/amd/powerplay: enable uclk dpm default on navi10

enable uclk (mclk) dpm by default on navi10

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>