MSM8916: iommu/qcom: Select IOMMU_DMA instead of ARM_DMA_USE_IOMMU (v3)

The ARM32 IOMMU DMA implementation does not really work properly
with qcom_iommu. It fails to attach to any IOMMU because a domain
is created by default in the driver.

Now that there is IOMMU_DMA support for ARM32, select it instead
of ARM_DMA_USE_IOMMU.

v2: 'depend on' instead of 'select' to fix circular dependency
v3: Move "select IOMMU_DMA" to CONFIG_ARCH_MSM8916

arch/arm/mach-qcom/Kconfig

@@ -24,6 +24,7 @@ config ARCH_MSM8X60
 config ARCH_MSM8916
 	bool "Enable support for MSM8916"
 	select HAVE_ARM_ARCH_TIMER
+	select IOMMU_DMA
 	help
 	  Enable support for the Qualcomm Snapdragon 410 (MSM8916/APQ8016).
 

drivers/iommu/Kconfig

@@ -448,7 +448,6 @@ config QCOM_IOMMU
 	select QCOM_SCM
 	select IOMMU_API
 	select IOMMU_IO_PGTABLE_LPAE
-	select ARM_DMA_USE_IOMMU
 	help
 	  Support for IOMMU on certain Qualcomm SoCs.