roll: third_party/pigweed 2 commits

a200b716cd13652 pw_rpc: Restructure Channel / internal::Channel
8a07d9f1ce8b58f pw_allocator: Clean up Block interface

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 17c1ee08b087155..a200b716cd13652
Roller-URL: https://ci.chromium.org/b/8745130274750371905
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I16882e64cc993f5c3367eb83a5067034cb089024
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/216252
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 17c1ee0..a200b71 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 17c1ee08b0871552ee50dd66ce2abd2c755e108a
+Subproject commit a200b716cd13652d7170b4d347ecf596456d853c