You may enter at the front entrance to Epcot or the Gateway entrance over by the Beach Club and Boardwalk area. If you go through the front, just walk back to the world showcase and tell he CM there that you have a breakfast ressie at Norway. They will let you through no problem. They just don't want guests w/o early dining ressies getting into that area before it opens.
If you go through the other entrance, a CM will be there ushering folks along into the rest of the park and letting them know the showcase does not open until 11 am. Just tell this CM about your breakfast and you can go to Norway at that point.