rework dc_start and dc_encap to take advantage of m_defrag.

if the chip needs coalesced packages in tx, set the tx dmamaps up
to only use a single dma descriptor. use m_defrag when bus_dmamap_load_mbuf
returns EFBIG rather than copying the packet to a separate mbuf
with hand rolled code in dc_coal. that in turn makes the ifq_deq_begin,
ifq_deq_commit, and ifq_deq_rollback handling more straightforward.

tested by me on a hppa a180c with a "DEC 21142/3", and fred on bugs@
with a sparc64 netra x1 "Davicom DM9102".

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