[third_party/pigweed] Roll 2 commits

4a9b1e019b19eb4 pw_bluetooth: Store length max in virtual field
d8c170bbb03c587 pw_sensor: Add module stub

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e79414ec1071a38..4a9b1e019b19eb4
Roller-URL: https://ci.chromium.org/b/8750917468174420161
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I055f14c5a1b7339b7ef1beda4593f74a2a4a6921
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/203031
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e79414e..4a9b1e0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e79414ec1071a382b92e56601bb569439b5d3125
+Subproject commit 4a9b1e019b19eb4fa669100c4af332dbee7aacf5