LAKITU: Append sudo to commands that read grub.cfg.

These changes are required for the following CL:
https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/11774

BUG=b/177854826
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I296674b9ef010e194b883e36ff8164c66e07e131
Reviewed-on: https://cos-review.googlesource.com/c/third_party/platform/crosutils/+/11430
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
2 files changed