Various macros (dma_map_sg_attrs, dma_unmap_sg_attrs,
dma_map_single_attrs, and dma_unmap_single_attrs) currently supress
passing on the attrs argument. Their implementation (even though at
times still marked the argument __unused; we remove that) have long
gained support for handling the argument.
With ofed fixed, pass the argument through so that other drivers
using these functions may hopefully work just a bit better as well.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days