msm: Add api to register virtual domain space

Going forward, clients may want to have more control over the
virtual address space for iommu domains. Add API to support
clients registering virtual address space information. Current
clients are internally converted to use the new APIs.

Change-Id: Iaec9f1cd150eefc02ce22c34790494b61f21eb12
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>