Add patch for check_update_payload multi signature

The current code requires all signatures be verified by
a given public key. With key rotation, we consider any
signature verified by the publick key as successful veification.

SDK needs to be updated after merging this.

BUG=b/379748060
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I6ed6a8d0a711a91e5f9a6f206e17d7752b3fe6c2
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/88501
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
2 files changed