[third_party/pigweed] Roll 2 commits

2e46e4ac3dfbbfc pw_config_loader: Remove unnecessary dep
1edf35a4ff1c563 pw_allocator: Add AsPmrAllocator

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 16fb026b93fcdad..2e46e4ac3dfbbfc
Roller-URL: https://ci.chromium.org/b/8747658065728438689
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I89bd6d6c457bf4237829e1ad9ad16facafe00a0d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/210353
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 16fb026..2e46e4a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 16fb026b93fcdad596b7ffdadf368839d0c5235b
+Subproject commit 2e46e4ac3dfbbfcaf31f5ff6e673b58dac71d6d4