[roll third_party/pigweed] pw_cpu_exception_cortex_m: Correct typo for ARMv8-M Mainline

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/78183

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: fe0fb9c54dd729b..7bb790b97ffe672
Roller-URL: https://ci.chromium.org/b/8825292928495287377
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8825292928495287377
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9f9cf71ff109fe0f7a1809625051c7dd7b83b023
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/78185
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index fe0fb9c..7bb790b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit fe0fb9c54dd729b5938fc5082abb4da014cc7846
+Subproject commit 7bb790b97ffe67246cc52a851d36246eb5365b1d