roll: third_party/pigweed 2 commits

aa6edfa23113a13 pw_toolchain: Add ARM Cortex-M55 toolchain
1f34bffa5c5c2b1 docs: Update changelog

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 679c11a0d545cd7..aa6edfa23113a13
Roller-URL: https://ci.chromium.org/b/8738567669773336673
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie8f58945e3a5bd4a31e4f4fc1d27b44dbfbe60ea
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/231973
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 679c11a..aa6edfa 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 679c11a0d545cd7b80740f49ef877562b8f0eda3
+Subproject commit aa6edfa23113a13509e89e7b9bb1eb35ead991cd