drm/amd/display: Update DCN3 bounding box

[Why]
We want to update the bounding box to have more granular control of the
DCFCLK.

[How]
Setup DCFCLK to use STA values and also optimal values based on
UCLK.

Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>