msm: devices-8660: Add iommu domain device

Add platform device describing the IOMMU domain layout for
8660. This will register the domains to allow allocation
of iommu virtual address space where appropriate.

Based in caf patch: d92be42944e11073b588d22276181d6973227dbd

Change-Id: I80b8460df9f9d849c409df3ad6502c99574f4be1