FROMLIST: iommu/dma: Allow drivers to reserve an iova range

Some devices have a memory map which contains gaps or holes.
In order for the device to have as much IOVA space as possible,
allow its driver to inform the DMA-IOMMU layer that it should
not allocate addresses from these holes.

Bug: 149544395
Link: https://lore.kernel.org/lkml/20200220185728.GA32137@pratikp-lnx/


Change-Id: I15bd1d313d889c2572d0eb2adecf6bebde3267f7
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>