roll: third_party/pigweed pw_kernel: Add the `mtval` to exception messages

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/308195
Copybara-Verified: Copybara Prod <copybara-worker-blackhole@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: d1fa0c5d140b10b328febd43dd67a07d64b71dc3

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 32d7a20ab4dc23..d1fa0c5d140b10
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8706632315921824193
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I989b6cc1e6573b66bf889a3ee05f5073ab81123c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/313072
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 32d7a20..d1fa0c5 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 32d7a20ab4dc237354bcd4704be850ed47d2f6de
+Subproject commit d1fa0c5d140b10b328febd43dd67a07d64b71dc3