iommu/tegra-gart: Staticize tegra_gart_pm_ops

'tegra_gart_pm_ops' is local to 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>
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index f75483a..dba1a9f 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -411,7 +411,7 @@
 	return 0;
 }
 
-const struct dev_pm_ops tegra_gart_pm_ops = {
+static const struct dev_pm_ops tegra_gart_pm_ops = {
 	.suspend	= tegra_gart_suspend,
 	.resume		= tegra_gart_resume,
 };