roll: third_party/pigweed: pw_bluetooth_sapphire: Import bt_host

Original-Bug: b/321267390
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/234727
Docs-Not-Needed: Ben Lawson <benlawson@google.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ab255ad1ab2b344..4cf921eb635b9b2
Roller-URL: https://ci.chromium.org/b/8737046365465709233
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I86b3c687b3648af44d8005b0fa440ac943e4fb70
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/235178
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index ab255ad..4cf921e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ab255ad1ab2b3442c70e8677c9572deaceb8ae13
+Subproject commit 4cf921eb635b9b23600d962de4b933cb80bf1635