roll: third_party/pigweed gn: Introduce new variables for 3p dependencies

Introduces the new variable names that will be used when referencing 3p
dependencies in Pigweed's GN build.

Original-Bug: b/410889733
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/284153
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 4c53c4723d91ef56fbd81cbd07d805cabcf5a7f4

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 996359c27afc91..4c53c4723d91ef
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8717415831672258705
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9aaeeaf13492caa077233b60e8ecbef5574583fe
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/284292
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 996359c..4c53c47 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 996359c27afc91dbecd3475c4e74b5e7b934692e
+Subproject commit 4c53c4723d91ef56fbd81cbd07d805cabcf5a7f4