e1000: fix unaligned register access
e1000: fix unaligned register access

This resolves a guru meditation in recent VirtualBox versions.

Change-Id: I5034d8af1fe885adda3c027cb23563bffaccf97e

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi