roll: third_party/pigweed 6681e2e..3c04c1c (5 commits)

3c04c1c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/265630 pw_uart: Enable layering check
a50bb66:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/265893 pw_digital_io: Enable layering check
80bffba:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/265892 pw_checksum: Enable layering check
d3bbb01:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/265872 pw_log: Enable layering check
fb39b72:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/265894 pw_function: Enable layering check

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6681e2e68ef55e..3c04c1c1c81f5a
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8723563917791066753
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id27a087dd09359f36d4506e5ed0a9d55887df145
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/266172
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 6681e2e..3c04c1c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6681e2e68ef55e6298733a2941448ad689289d54
+Subproject commit 3c04c1c1c81f5a97f557e0191a1345c7453378bf