implement bus_dmamem_free()

from Robert Millan <rmh@freebsd.org> via rumpkernel-users

Add a vacookie to busdma_segment, for potential help with bus_dmamem_map()

make tags and handles long

+BUS_DMA_TAG_IS_VALID

Make dma_tag_t a bit more useful.

XXX: this header should definitely not exist, but given that it does,
let's use it to make life easier. The implication of its existence is
that x86 port rump kern

Make dma_tag_t a bit more useful.

XXX: this header should definitely not exist, but given that it does,
let's use it to make life easier. The implication of its existence is
that x86 port rump kernel components are not ABI-compatible with kernel
modules which use bus_space/bus_dma. I'm not sure if anyone is interested
in that...

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Use <sys/bus.h> not <machine/bus.h>.