Revert "Remove qrngd"

 * Bring this back. It improves boot time on several devices. The
   built-in seeder is oneshot.

This reverts commit 89b023b691148d299bed54b5c4807cfb72e61a4f.

Change-Id: Ic9e272b7a5d797d06e9a3109328ef6aa0a13b172
Revert "Revert "manifest: Trebuchet""

Blockers are all out of the way, lets do this thing.
This reverts commit fd42a60e05f2bee1a29f78a5ab48d1a6b79eadaf.

Change-Id: Icc050376c32af0cefe7a71b3c3a58da5f9bb518d