drm/amd/display: Lower DPP DTO only when safe
[Why] A corner case currently exists where DPP DTO is lowered before pipes are updated to a higher viewport. This causes underflow as the DPPCLK is too low for the current viewport. [How] Only lower DPP DTO when it is safe to lower, or if the newer clocks are higher than the current ones. Signed-off-by: NSung Lee <sung.lee@amd.com> Reviewed-by: NDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com> Reviewed-by: NTony Cheng <Tony.Cheng@amd.com> Acked-by: NRodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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