[roll third_party/pigweed] pw_env_setup: Relax submodule presence checks
Relax the check on submodule presence. Can now use required_submodules
to only check the presence of a subset of submodules. No simple way to
skip all submodule presence checks, but the source repository likely has
Pigweed as a submodule and likely doesn't work well without Pigweed, so
adding Pigweed as the sole required submodule should be sufficient.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/53100
third_party/pigweed Rolled-Commits: 40a9c3f128f6a27..a93870160952990
Roller-URL: https://ci.chromium.org/b/8841694661303930592
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8841694661303930592
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie0cd7316d809048bd8ab8be0edeada37e6828f1b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/53121
Reviewed-by: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 40a9c3f..a938701 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 40a9c3f128f6a279d6aee6aef45705725689189a
+Subproject commit a938701609529906c7cef37b167ccf8ef4a2c478
