iommu/tegra-smmu: Staticize tegra_smmu_pm_ops

'tegra_smmu_pm_ops' is used only in this file. Make it static.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

drivers/iommu/tegra-smmu.c

@@ -1254,7 +1254,7 @@ static int tegra_smmu_remove(struct platform_device *pdev)
 	return 0;
 }
 
-const struct dev_pm_ops tegra_smmu_pm_ops = {
+static const struct dev_pm_ops tegra_smmu_pm_ops = {
 	.suspend	= tegra_smmu_suspend,
 	.resume		= tegra_smmu_resume,
 };