drm/amd/powerplay: add smumgr support for VEGAM (v2)

The smumgr handles communication between the driver
and the SMU for power management.

v2: fix typo (Alex)

Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 files changed