Added Atom ROMs, including AVR version AtomMMC 2.9.5

Change-Id: I1e5cca4ec771f5809dd5527e501f16303959ea6d
Added AVR8 External Interrupt Controller - http://forum.gadgetfactory.net/index.php?/topic/1527-external-interrupt-controller-for-avr8

Change-Id: Ic816a24ff3a9d06e128fd4fe070b080552151c39