roll: third_party/pigweed: pw_cpu_exception_cortex_m: Add armv6-m support

Original-Bug: https://pwbug.dev/350747553
Original-Fixes: https://pwbug.dev/350747562

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/219132
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e6ad28bbb6ac1c6..27aedcf1158eb97
Roller-URL: https://ci.chromium.org/b/8742688382080544257
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I52f1829eb557948829778f05e76cecf691fc7ded
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/222352
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: 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 e6ad28b..27aedcf 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e6ad28bbb6ac1c61c7603fba8be460fcc724d3d6
+Subproject commit 27aedcf1158eb9752b063661ad9c6cf29168625e