Turn emugen unittests back on

Previously disabled, since it depends on some un-merged CLs;
now those CLs are all merged and we should turn the emugen
unittests back on.

Change-Id: Iaa1711a48cbcf26b6ebe2e513071035781a52903
(cherry picked from commit 81e9011e4fb3d3a9f315779cbaf3a1319d564179)
Merge "Turn emugen unittests back on" into studio-1.0-dev