tht wants at least 128 bytes in the first physical segment of an rx buffer

for some reason, so i had some code in there that tried to guarantee that.
however, newly allocated mbufs and clusters are physically contiguous and
bigger than 128 bytes. therefore we dont need to do that check.

while here check if there is enough space in the fifo before trying to
fill any of it. this means we can skip dma syncs if we're not going to end
up writing anything in the fifo.

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