templates/feature/agl-compositor: Replace SRCREVs with AUTOREV

templates/feature/agl-compositor: Replace SRCREVs with AUTOREV

As the applications are still in flux and require often modifcations
use AUTOREV to point to HEAD.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Suggested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Change-Id: Icdd2b5e0aa7a59fb32c65ce67c7d5bd2a3542b71
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24539
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>