edgeos: bump upstream to 5.15.157

BUG=b/338072807, b/338074141, b/338074093, b/338074167, b/338073973, b/338074284, b/338074421, b/338073568, b/338074345
TEST=emerge,presubmit
RELEASE_NOTE=n/a

Change-Id: Ie2cfe8b0158288bd9ee0b6968c20af28327e7ce4
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/70991
Reviewed-by: Zizheng Wu <zizhengwu@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
3 files changed