roll: third_party/pigweed: pw_cpu_exception: Remove multiplexers

Original-Bug: 347998044
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/219371
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1fe2f388a99a60c..9ea805fc87d0853
Roller-URL: https://ci.chromium.org/b/8743389465563487905
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7e0e784443255d88efa8635bc3a93bedc5ca2ad7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/220138
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
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diff --git a/third_party/pigweed b/third_party/pigweed
index 1fe2f38..9ea805f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1fe2f388a99a60cfa30c67464b59765d05cc7ce5
+Subproject commit 9ea805fc87d085308bc966d847da31221d4bc062