iommu: Allow iova to be used without requiring IOMMU_SUPPORT

iova is a library which can be built without IOMMU_SUPPORT
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iommu/Kconfig

@@ -12,6 +12,9 @@ menuconfig IOMMU_SUPPORT
 	  remap DMA requests and/or remap interrupts from other devices on the
 	  system.
 
+config IOMMU_IOVA
+	tristate
+
 if IOMMU_SUPPORT
 
 menu "Generic IOMMU Pagetable Support"
@@ -42,9 +45,6 @@ config IOMMU_IO_PGTABLE_LPAE_SELFTEST
 
 endmenu
 
-config IOMMU_IOVA
-	tristate
-
 config OF_IOMMU
        def_bool y
        depends on OF && IOMMU_API