This fairly simply series adds support to ib_alloc_pd to create the unsafe
global rkey in the IB core, and then switches over all ULPs to use that
functionality instead of using ib_get_dma_mr directly, and consequently
removes ib_get_dma_mr now that all global registrations are done in the
core code.

The advantage is that abuses of ib_get_dma_mr are more easily prevented,
and use of the global unsafe rkey is more visible and auditable.

I'm also pondering removing the get_dma_mr methods and moving the global
registrations into the ->alloc_pd methods, but I'll need to investigate
how that will work out first.

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