roll: third_party/pigweed: pw_bluetooth_proxy: Move to using H4Packet wrapper classes

Use wrapper class rather than wrapper struct. This will make it easier
to use mix of H4-based and HCI-based packets. It also will provide the
location for releasing of buffers after container send.

Original-Bug: 326499764
Original-Bug: 326497489
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/215222
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: c6f3a9eeb718be6..e6c5165547f3054
Roller-URL: https://ci.chromium.org/b/8744677029703772785
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1bf76962a9483f782c727dedcbda5a9f619e9288
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/216952
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 c6f3a9e..e6c5165 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c6f3a9eeb718be6277472edab7536768a834436d
+Subproject commit e6c5165547f305416c6d11b1a911e912f2aecb6b