roll: third_party/pigweed 2 commits

d97c1620775ac5c pw_unit_test: Delete unsupported C++14 compatibilt
9b242113ab06e86 pw_kvs: Remove unnecessary Key alias and test

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 5e9e39285969463..d97c1620775ac5c
Roller-URL: https://ci.chromium.org/b/8739421219924194625
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If932bb9ea3012f8e9f717f141a2920b3bc54d661
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/230371
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 5e9e392..d97c162 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 5e9e39285969463893c92043ff509958ec5eec40
+Subproject commit d97c1620775ac5cb0a80c08913d70eda760e80bd