iommu/tegra: Add missing spinlock initialization

Fix tegra_smmu_probe() to initialize client_lock spinlocks in
per-address-space structures.
Signed-off-by: Sami Liedes <sliedes@nvidia.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

drivers/iommu/tegra-smmu.c

 /*
  * IOMMU API for SMMU in Tegra30
  *
- * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2013, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -1216,6 +1216,7 @@ static int tegra_smmu_probe(struct platform_device *pdev)
 		as->pte_attr = _PTE_ATTR;
 
 		spin_lock_init(&as->lock);
+		spin_lock_init(&as->client_lock);
 		INIT_LIST_HEAD(&as->client);
 	}
 	spin_lock_init(&smmu->lock);