msm: iommu: Create a Kconfig item for the IOMMU driver

Break the IOMMU driver out as a Kconfig item. Initially it
was decided to always build this in for 8x60, but this
driver is not strictly necessary and should be optionally
selectable.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index df9d74e..32b9d1f 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -45,7 +45,6 @@
 	select CPU_V7
 	select MSM_V2_TLMM
 	select MSM_GPIOMUX
-	select IOMMU_API
 	select MSM_SCM if SMP
 
 config ARCH_MSM8960
@@ -149,6 +148,18 @@
 
 endmenu
 
+config MSM_IOMMU
+	bool "MSM IOMMU Support"
+	depends on ARCH_MSM8X60
+	select IOMMU_API
+	default n
+	help
+	  Support for the IOMMUs found on certain Qualcomm SOCs.
+	  These IOMMUs allow virtualization of the address space used by most
+	  cores within the multimedia subsystem.
+
+	  If unsure, say N here.
+
 config IOMMU_PGTABLES_L2
 	def_bool y
 	depends on ARCH_MSM8X60 && MMU && SMP && CPU_DCACHE_DISABLE=n