OWNERS: assign to autotest-drone owners

Build/CI/CQ no longer uses anything from this project, so drop
ourselves from it, and assign to the only user left: autotest-drone.

BUG=b:266847445
TEST=CQ passes

Change-Id: I4a90fc1af0ffd85f671953cbc8de8f8c15f432b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra_virtualenv/+/7857237
Reviewed-by: Otabek Kasimov <otabek@google.com>
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>

OWNERS

diff --git a/OWNERS b/OWNERS
index a83f860..fb31c4d 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,7 +1,4 @@
 ayatane@chromium.org
 xixuan@chromium.org
 
-include chromiumos/owners:v1:/infra/OWNERS.build
-include chromiumos/owners:v1:/infra/OWNERS.ci
-# For cbuildbot usage.
-include chromiumos/owners:v1:/infra/OWNERS.release
+include chromiumos/owners:v1:/infra/OWNERS.fleetplatform