x64: Clear PG bit properly
x64: Clear PG bit properly

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