drm/amd/display: Fix divide-by-zero in DPPCLK and DISPCLK calculation
[Why] Certain use cases will pass in zero in the new_clocks parameter for all clocks. This results in a divide-by-zero error when attempting to round up the new clock. When new_clocks are zero, no rounding is required, so we can skip it. [How] Guard the division calculation with a check to make sure clocks are not zero. Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: George Shen <george.shen@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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