gmec: Add some debug utilitilies

These utilities are extremely useful for diagnostics on baremetal machines.

BUG=b/181615183
TEST=ping6 is available in the image
RELEASE_NOTE=None

Change-Id: I262682347b8e2ca14c308efac012b820ee811a31
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/13490
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
2 files changed