[third_party/pigweed] Roll 4 commits

8238a71197c1740 pw_presubmit: Add coverage of rp2040 build
7caae4341a12221 pw_digital_io: Remove invalid digital_io_controlle
e5a422617a97261 pw_log_string: Introduce link time assert() wrappe
afc838865bf00de pw_stream: Fix include in mpsc_stream

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: b68fbb19c4f651c..8238a71197c1740
Roller-URL: https://ci.chromium.org/b/8745492860023110321
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9c631deef7eecf4027422ead73638116fb8523cc
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/215292
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 b68fbb1..8238a71 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b68fbb19c4f651c9abfc52c77d44b5e29878cf97
+Subproject commit 8238a71197c1740d44a4ba84d65618845ed2f34c