Revert "iommu: Allow iova to be used without requiring IOMMU_SUPPORT"

Revert 'commit 353649e5 ("iommu: Allow iova to be used without
requiring IOMMU_SUPPORT"). This commit is made unnecessary by
'commit ac6d83cc ("misc: mic: Fix SCIF build failure with
IOMMU_SUPPORT disabled") and will create a conflict upon merging
with 4.3-rc4. The correct long term solution is to move the iova
library from drivers/iommu into lib/iova which will be done in
a future patch.

Cc: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: NAshutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: NSudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iommu/Kconfig

@@ -12,9 +12,6 @@ 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"
@@ -45,6 +42,9 @@ config IOMMU_IO_PGTABLE_LPAE_SELFTEST
 
 endmenu
 
+config IOMMU_IOVA
+	tristate
+
 config OF_IOMMU
        def_bool y
        depends on OF && IOMMU_API