edgeos: fix crosscompile for efivar

Ian's earlier changes appear to have gotten lost in a CrOS merge. May
have also been because the package moved from portage-stable to
chromiumos-overlay.

See prior art at go/cos-review/50046 and go/cos-review/50047

BUG=b/295537948
TEST=running presubmits
RELEASE_NOTE=n/a

Change-Id: I32e0402d8b2f98b3f6e0d73adc0add41dd6bb949
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/60495
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
3 files changed