roll: third_party/pigweed c4fca6b..351d6c1 (6 commits)

351d6c1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/264642 pw_allocator: Restrict BlockAllocator's public interface
4a365f6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/252053 pw_malloc: Rename GetSystemAllocator to CreateSystemAllocator
358d2b6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/272752 pw_clock_tree: Add note in ClockTree::AcquireWith() doc comment
43cf8d7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/249914 pw_malloc: Synchronize access to the system metrics
986272f:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/273194 pw_bluetooth_sapphire: Remove nbsp
8838270:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/272532 pw_allocator: Re-enable code-size reports

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: c4fca6b2f22121..351d6c113372ea
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8721113483694173985
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib77ae85264f24168862cfe1bca9de65d80933eb8
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/273432
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 c4fca6b..351d6c1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c4fca6b2f2212127f4caf59b362bbfff65ba7c36
+Subproject commit 351d6c113372eac715c2068a8b24f77da7631640