iommu: Add api to retrieve stream-id for a device

MSM PCI hardware has a programmable table which converts BDF to SID.
Provide a way for MSM PCI software to retrieve the SID for a particular
PCI device in order to program this table.

Change-Id: Ice04bbd02af6f77e588e9b4f37c1387a105b3d27
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
2 files changed