openssh: Upgraded the package to upstream.

Upgraded net-misc/openssh package to version 9.0 on amd64, arm64.

Removed linux-headers version restriction and added condition
on removing dir var/empty to make it work in COS.

BUG=None
TEST=presubmit, validation
RELEASE_NOTE=Upgraded openssh package to v9.0_p1.

Change-Id: I1e2c36c1742613d6095cb89d11dc075f824ee80c
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/31902
Reviewed-by: He Gao <hegao@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
33 files changed