[third_party/pigweed] Roll 2 commits

b9c896e42d2b7bb pw_bluetooth: Add LEReadLocalSupportedFeaturesComm
5a0cb51b0ae5236 SEED: Update process document

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 6dc019b67e3e099..b9c896e42d2b7bb
Roller-URL: https://ci.chromium.org/b/8770220725020899409
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8e1a31ea558b65e3bca37cbd4d462d1c3a6339cc
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/170433
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 6dc019b..b9c896e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6dc019b67e3e099a7eff8be0240ed960a9aa954c
+Subproject commit b9c896e42d2b7bbcb15d53254b418748ffec2b3b