arm64 stages

Built the week of Feb 23rd, 2015 on the HiKey 96 board. Features gcc 4.9.2, glibc 2.21. The purpose of this is to use as a HiKey test vehicle as well as for arm64 stabilization efforts

Portage snapshot used for stage building.

The HiKey in particular needs to have media dd'd to the eMMC or to an uSD card. Experimental kernel & img TBD.