Create an architecture-agnostic buffer pool manager that uses uma(9) to

manage a set of power-of-2 sized buffers for bus_dmamem_alloc().

This allows the caller to provide the back-end allocator uma allocator,
allowing full control of the memory pages backing the pool.  For
convenience, it provides an optional builtin allocator that provides pages
allocated with the VM_MEMATTR_UNCACHEABLE attribute, for managing pools of
DMA buffers for BUS_DMA_COHERENT or BUS_DMA_NOCACHE.

This also allows the caller to specify a minimum alignment, and it ensures
that all buffers start on a boundary and have a length that's a multiple of
that value, to avoid using buffers that trigger partial cache line flushes.

Submitted by:	Ian Lepore <freebsd@damnhippie.dyndns.org>

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