This allows you to look at the current DPM state via
debugfs.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

This adds dpm support for KB/KV asics.  This includes:
- dynamic engine clock scaling
- dynamic voltage scaling
- power containment
- shader power scaling

Set radeon.dpm=1 to enable.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>