annotate some packed structures with the alignment the hardware

requires and the driver provides. without this gcc assumes the
alignment of these structures is 1, which leads to some horrible
asm.

this is particularly interesting when reading stuff from the
myx_status struct (like the txdone count) which needs to be atomic.
doing byte reads and shifting them into a word in registers isnt
atomic. its also probably a bit slow. specifying the alignment fixes
this.

deraadt@ warned me about this maybe 8 years ago.

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