[roll third_party/pigweed] pw_toolchain_bazel: Add custom PwFlagSetInfo

See linked bug for motivation

For now, since BazelToolsFlagSetInfo is in active use, we will still
provide the old provider. However, once we migrate FeatureInfo and
ActionConfigInfo  to use the new FlagSetInfo, we will remove it.

Original-Bug: 322872628
Test: bazel build //tests/...
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/188990

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 905522bde753d85..9fcd145216a27e4
Roller-URL: https://ci.chromium.org/b/8757419371179948433
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8b5a4a5633199917163cac806181c560b7efb5d8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/189780
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 905522b..9fcd145 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 905522bde753d859f50c6d1e053167873f51b4cf
+Subproject commit 9fcd145216a27e4ad89f022fadf2ba1f2fe12c4e