iommu/exynos: Select ARM_DMA_USE_IOMMU

For IOMMU to use on Exynos platforms, we need to enable ARM_DMA_USE_IOMMU. It
would be better to select it by default when EXYNOS_IOMMU is enabled.
Signed-off-by: NTushar Behera <tushar.b@samsung.com>
Reviewed-by: NSachin Kamat <sachin.kamat@samsung.com>
Reviewed-by: NCho KyongHo <pullip.cho@samsung.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -180,6 +180,7 @@ config EXYNOS_IOMMU
 	bool "Exynos IOMMU Support"
 	depends on ARCH_EXYNOS
 	select IOMMU_API
+	select ARM_DMA_USE_IOMMU
 	help
 	  Support for the IOMMU (System MMU) of Samsung Exynos application
 	  processor family. This enables H/W multimedia accelerators to see