dma: tegra20-apb-dma: Staticize tegra_dma_prep_dma_cyclic
tegra_dma_prep_dma_cyclic is referenced only in this file. Make it static. Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org> Acked-by: NLaxman Dewangan <ldewangan@nvidia.com> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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