Enable tgl for percheckin builds
Based on my testing, the platform is reliable for 64bit glcts, glescts, deqp, and piglit testing:
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6173/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6169/ (single flake-failure now disabled)
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6168/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6167/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6166/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6165/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6164/ (component failure due to non-standard kernel, fixed)
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6163/
http://otc-mesa-ci.jf.intel.com/job/mesa_custom/6162/