Add missing bus_dmamap_sync() calls.  If you are using an architecture with a weak memory model or x86 + PAE (or more specifically, your driver is using bounce pages) and you have had problems with em(4), this may fix it.  At least this is needed to have em(4) work properly on FreeBSD/arm.
Add missing bus_dmamap_sync() calls.  If you are using an architecture
with a weak memory model or x86 + PAE (or more specifically, your
driver is using bounce pages) and you have had problems with em(4),
this may fix it.  At least this is needed to have em(4) work properly
on FreeBSD/arm.

Original version by:	cognet
Reviewed by:		tackerman
Tested by:		cognet

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