Replace the sdk repository reference with a hard sha reference

The tag apparently has different meanings/contents in different
google mirrors for this particular repo... FUN!

Change-Id: I5f9335af4da7114d83457ca041026f3be99c32ce
Switch to our own fork of ART

Change-Id: I85ca84303ce53183892911aadae921800a1415d5
Merge branch 'HEAD', remote-tracking branch 'cm/cm-11.0' into default