minnowboard: Add MMA7660 and LSM303D accelerometer BUG=none Tracked-On:https://jira01.devtools.intel.com/browse/BP-266 Change-Id: I858363501aa93b4f566b196b9d3f70b463641806 Signed-off-by: Alexandru Palalau <alexandru.palalau@intel.com> Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>