Add support for managing DCN3.2.x clocks.

v2: squash in smu interface updates (Alex)
v3: Drop unused SMU header (Alex)
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>