Alexander Motin 3986af1f65 Use bus_dmamem_alloc(9) KPI instead of contigmalloc(9).
I suppose it should make this code NUMA-aware with recent NUMA drop-in,
trying to allocate shared memory buffers from domain closer to NT-bridge.

MFC after:	2 weeks
2018-01-26 22:22:26 +00:00
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