roll: third_party/pigweed b9b86d5..fa201d6 (2 commits)

fa201d6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/321673 pw_bluetooth_proxy: Mutex l2cap signal identifier increment
d1754c6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/321672 pw_bluetooth_proxy: Register channel after complete ctor

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: b9b86d5be9a960..fa201d6ef38a92
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8703897397802581841
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I551f9dd8b4f3bcd4b24b13abbf4163a986910c27
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/321854
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index b9b86d5..fa201d6 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b9b86d5be9a96092608d624913c3916b7eb9765f
+Subproject commit fa201d6ef38a924d109711a8faf12560997fc33f