Add trousers' init scripts

Part of a three CLs change that moves trousers' init scripts from
platform/init to platform/trousers.

BUG=chromium:351868
TEST=Build chromeos-init and trousers. Both scripts are owned by trousers.

CQ-DEPEND=If83d13a55bc8695c9480d876dab2a03648ed29e0
CQ-DEPEND=I72d477634d3349ea02f9360693e764604d76f47d

Change-Id: I7c5c6b6c82ec0a8395a8ba2564b95f434116efab
Reviewed-on: https://chromium-review.googlesource.com/190376
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
2 files changed