drm/amd/pm: enable fclk ds feature for SMU 13.0.0

The feature is ready with latest 78.39.0 PMFW.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Change-Id: I99096e23ed7ebcd5aaada84b7f11ad9e3d3cd8b8