hwc: Enable retire fences

Change-Id: I13418397cc63ce14ead37a74e24b77efa71eb427
Remove Trebuchet overlay

This is outdated and breaks the new Trebuchet

Change-Id: I5b5ce213b4a7c28726aee92b71129e1005e0961b
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0