[roll] Roll fuchsia [lowpan-ot-driver] Adding bootstrap fidl impl

Implements the server side of fuchsia.lowpan.bootstrap fidl.

Original-Bug: 107546

Tests: 1) Tested manually end-to-end in real
       world use case by Krithika by pulling in patch.
       The testing passes - FIDL successfully writes expected data
       to the files.

       2) Tested Thread Certification test cases to ensure that addition
       of this code doesn't affect normal behavior.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/716231
Original-Revision: 2ec40af0c949e6e825bb941f73b72208e70a8544
GitOrigin-RevId: df65d189e7c4a035a60cbd193546fbd7e1e9f4db
Change-Id: I32343d8cc1e18e1a9a1c0557a126d32e6c2f38eb
diff --git a/stem b/stem
index c69cf97..096e9e0 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="55e8f3536acdd7cc98b719f5d383037375d51c83"/>
+             revision="2ec40af0c949e6e825bb941f73b72208e70a8544"/>
   </projects>
   <hooks>
     <hook name="install-environment"