ARM:OMAP4:provide build support for omap4 iommu

This patch provides build support to build OMAP4
IOMMU module. This also adds the changes to Kconfig
file to make iommu option visible in menuconfig.
Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com>

arch/arm/mach-omap2/Makefile

@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_OMAP3)		+= clock34xx.o
 
 iommu-y					+= iommu2.o
 iommu-$(CONFIG_ARCH_OMAP3)		+= omap3-iommu.o
-
+iommu-$(CONFIG_ARCH_OMAP4)              += omap4-iommu.o
 obj-$(CONFIG_OMAP_IOMMU)		+= $(iommu-y)
 
 # Specific board support

arch/arm/plat-omap/Kconfig

@@ -118,8 +118,8 @@ config OMAP_MBOX_FWK
 	  DSP, IVA1.0 and IVA2 in OMAP1/2/3.
 
 config OMAP_IOMMU
-	tristate
-
+	tristate "iommu"
+        depends on ARCH_OMAP
 choice
         prompt "System timer"
 	default OMAP_MPU_TIMER