drm/amd/pm: pp_dpm_* interface for smu_v13_0_7

add the sysfs pp_dpm_* interface for smu_v13_0_7

Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Jack Gui <Jack.Gui@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>