[roll third_party/pigweed] pw_sensor: Claim SEED number for high level view

Add a SEED for a high level view of sensors in Pigweed

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/182673

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 2fda6c82d5b6004..c821a51c8023c9a
Roller-URL: https://ci.chromium.org/b/8763246636443794401
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie171cd3e6ff311fd5e0f0922c0a3b101379e27d0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/182675
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 2fda6c8..c821a51 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 2fda6c82d5b60041e24f285af6e1a707114bcd9d
+Subproject commit c821a51c8023c9a6f2bfa381c138e282b8807b44