opensemc: track an appropriate mr2 kernel for fuji boards

Yep, we're getting close.
track local aosp based gcc repo [1/2]

Summary:
contains 4.6, 4.7, and 4.8 repos.
This change makes it easier to merge good
changes upstream as well as moving us to
utilizing stable release tags only.

Test Plan: win

Reviewers: randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D385

Change-Id: Ice7263bb5265c47cf4fdb2ec3c04b398f5093788
Merge branch 'jb-devel-mr2-release' into jb-devel-mr2-staging

Conflicts:
	default.xml

Change-Id: I086e43fb735d89fc03984ea80d81b148c4e58c9c