drm/radeon: enable DPM by default on SI asics
drm/radeon: enable DPM by default on SI asics

Seems to be stable on them and improves peformance
as most SI asics have very low boot clocks.

Signed-off-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs