[roll third_party/pigweed] pw_env_setup: Create more options

Split up environment config files so it's easier to set up just a subset
of CIPD packages. Splitting out Bazel and Python for now.

Original-Bug: 392
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47088

third_party/pigweed Rolled-Commits: be27297eda420d0..b71fed24ee6be3e
Roller-URL: https://ci.chromium.org/b/8845504749535864896
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8845504749535864896
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7d44523e0be4f8054f8187aac504612b9144daaa
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47721
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 be27297..b71fed2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit be27297eda420d040080bd7f335db165223dbe68
+Subproject commit b71fed24ee6be3e0dfb1fe3de2b253891a9a60e8