msm: iommu: Kconfig dependency for the IOMMU API

Make the IOMMU driver select the IOMMU API in the kernel
configuration.
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

arch/arm/mach-msm/Kconfig

@@ -44,6 +44,7 @@ config ARCH_MSM8X60
 	select CPU_V7
 	select MSM_V2_TLMM
 	select MSM_GPIOMUX
+	select IOMMU_API
 
 endchoice
 
@@ -166,4 +167,7 @@ config MSM_GPIOMUX
 
 config MSM_V2_TLMM
 	bool
+
+config IOMMU_API
+	bool
 endif