roll: third_party/pigweed 3505087..120f202 (4 commits)

120f202:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239719 pw_atomic: Add module for atomic operations
e23dc00:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/260474 pw_toolchain: Implement layering check feature
e54e607:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/260262 pw_toolchain: Remove cortex-m33+nofp
2fa4c63:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/260752 pw_bluetooth_sapphire: Implement ISO expectations in MockController

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 35050876ee8e38..120f202e25b4c5
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8725469239880012401
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I34b30cd4502c70e76dfdd29a9b62e6f7a12fce20
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/261234
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 3505087..120f202 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 35050876ee8e38a50c1af61b20a718a87bd6cca3
+Subproject commit 120f202e25b4c59111012e9568c74f4af2fdb09d