iommu: Add support for probe deferral

Some drivers may probe before the iommu driver is ready. Until the
iommu framework has a formal solution for probe deferral, give these
drivers a function to call which will indicate if the device's iommu
dependencies are available.

Change-Id: If52693793f02fb199a6fee5da7ea15e17635625a
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
2 files changed