drm/amd/display: align DCLK to voltage level

in past program SMU will use all voltage headroom.  RV does not

if DAL need higher voltage for DCFCLK or DISPCLK, also increase FCLK
to improve stutter as voltage is already

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>