the bus_space api implies that there's a bus endianness that it will

swap for you to the hosts endianness. sometimes you dont want this hand
holding and just want raw access to the registers. bus_space does have
stuff to do this already, but they deal with buffers which can be awkward
if you just want to get or set a single register.

this adds the following to i386 and amd64:

bus_space_read_raw_2() bus_space_read_raw_4() bus_space_read_raw_8()
bus_space_write_raw_2() bus_space_write_raw_4() bus_space_write_raw_8()

sparc64 already implements this, even though it wasnt part of the
official api. how handy.

i'll do other archs as i can.

kettenis@ and miod@ seem ok with this

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