roll: third_party/pigweed bedff50..d6640a2 (3 commits)

d6640a2:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/482670 pw_rpc2: Truncate oversized handshake packet buffers
3d3bb6e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/480385 pw_kernel: Introduce shared Channel object for IPC endpoints
784a17d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/482849 pw_kernel: Add smp feature flag and SMP platform configurations

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: bedff50f0f9ff9..d6640a206bf18e
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8669921381499052561
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If99d8e2b399ff6cccc5d7395ba2b23ac71ae289f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/483089
diff --git a/third_party/pigweed b/third_party/pigweed
index bedff50..d6640a2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit bedff50f0f9ff955e481b258f49e9b63fcdc2352
+Subproject commit d6640a206bf18e78c3b965a03c71aabea67cf5b2