drm/amd/display: Don't apply FIFO resync W/A if rdivider = 0
[Description] It is not valid to set the WDIVIDER value to 0, so do not re-write to DISPCLK_WDIVIDER if the current value is 0 (i.e., it is at it's initial value and we have not made any requests to change DISPCLK yet). Reviewed-by: NSaaem Rizvi <syedsaaem.rizvi@amd.com> Acked-by: NAlex Hung <alex.hung@amd.com> Signed-off-by: NAlvin Lee <alvin.lee2@amd.com> Tested-by: NDaniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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