iommu/vt-d: Remove iova_cache_get/put()

These have been done in drivers/iommu/dma-iommu.c. Remove this duplicate
code.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20220214025704.3184654-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20220301020159.633356-4-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel/iommu.c

@@ -3381,9 +3381,6 @@ static inline int iommu_devinfo_cache_init(void)
 static int __init iommu_init_mempool(void)
 {
 	int ret;
-	ret = iova_cache_get();
-	if (ret)
-		return ret;
 
 	ret = iommu_domain_cache_init();
 	if (ret)
@@ -3395,7 +3392,6 @@ static int __init iommu_init_mempool(void)
 
 	kmem_cache_destroy(iommu_domain_cache);
 domain_error:
-	iova_cache_put();
 
 	return -ENOMEM;
 }
@@ -3404,7 +3400,6 @@ static void __init iommu_exit_mempool(void)
 {
 	kmem_cache_destroy(iommu_devinfo_cache);
 	kmem_cache_destroy(iommu_domain_cache);
-	iova_cache_put();
 }
 
 static void __init init_no_remapping_devices(void)