[roll third_party/pigweed] pw_bluetooth: Add RoleChangeEvent emboss definition

Test: pw presubmit --step gn_emboss_nanopb_build
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/167230

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e8a541f8a5f8e10..9e4bfb92eb5ad74
Roller-URL: https://ci.chromium.org/b/8772176100870073473
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I28d63650346d0a3cc921806603dc5e0372bbfeaf
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/167342
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 e8a541f..9e4bfb9 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e8a541f8a5f8e10157da8ed49a5c6d4e0c022065
+Subproject commit 9e4bfb92eb5ad7458d7d4fd3543fb6f115cc744a