Revert "manifest: Trebuchet is in the default manifest now"

It got removed again...

This reverts commit 7d3bc0e175a9ab25ca886edda0ea91772cd17e1a.

Change-Id: Ie111fc267544bdcf1041acf3549dd34a4b7ffedc
Merge "Revert "manifest: Trebuchet is in the default manifest now"" into cm-11.0