roll: third_party/pigweed pw_bluetooth_sapphire: Delete StartAdvertisingInternalStep2 return

Delete unused LowEnergyAdvertiser::StartAdvertisingInternalStep2 return
value.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/296053
Original-Revision: 917f2ae2f5e78ab6ae84639b2d300cf95a81b99e

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 5996f8ff438279..917f2ae2f5e78a
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8712933310242982417
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5270defb119d328978b8c1d61b7092f8f5ebb6f6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/296294
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: 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 5996f8f..917f2ae 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 5996f8ff438279ec2d1470a546a221da96cb23cb
+Subproject commit 917f2ae2f5e78ab6ae84639b2d300cf95a81b99e