e1000: Optimize recv to avoid MMIO writes
e1000: Optimize recv to avoid MMIO writes

alfred-bratterud/IncludeOS,ingve/IncludeOS,mnordsletten/IncludeOS,AndreasAakesson/IncludeOS,mnordsletten/IncludeOS,mnordsletten/IncludeOS,mnordsletten/IncludeOS,hioa-cs/IncludeOS,AnnikaH/IncludeOS,AnnikaH/IncludeOS,mnordsletten/IncludeOS,hioa-cs/IncludeOS,hioa-cs/IncludeOS,alfred-bratterud/IncludeOS,alfred-bratterud/IncludeOS,AndreasAakesson/IncludeOS,ingve/IncludeOS,AnnikaH/IncludeOS,AndreasAakesson/IncludeOS,ingve/IncludeOS,AndreasAakesson/IncludeOS,AndreasAakesson/IncludeOS,mnordsletten/IncludeOS,ingve/IncludeOS,AnnikaH/IncludeOS,alfred-bratterud/IncludeOS,AndreasAakesson/IncludeOS,ingve/IncludeOS,hioa-cs/IncludeOS,hioa-cs/IncludeOS,AnnikaH/IncludeOS,alfred-bratterud/IncludeOS