submodule: bump openthread from `37f9d17` to `3fdaaab` (#198)
submodule: bump openthread from `37f9d17` to `3fdaaab` (#198)

Bumps [openthread](https://github.com/openthread/openthread) from `37f9d17` to `3fdaaab`.
- [Commits](https://github.com/openthread/openthread/compare/37f9d171c086429adee54951709b10c8d18372f3...3fdaaab07c2dc3d322d0b4f8a31c812330be6e3a)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-cc2538,openthread/ot-cc2538