drm/amd/display: Revert "DCN2.x Do not program DPPCLK if same value"

[WHY]
Not programming dto with same values causes test failures in DCN2 diags
DPP tests.

[HOW]
This reverts commit 1b53e733.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>