sys-kernel: Remove kernel 6.1 package

BUG=b/353766553
TEST=presubmit, validation
RELEASE_NOTE=None

Change-Id: I7f702d825bca691d154eb16f09dd1810e0d3b575
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/76801
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
44 files changed