[roll third_party/pigweed] pw_build: Add Pigweed specific Bazel platforms

This change adds a set of constraint_settings constraint_values and
platforms specific to pigweed. This is also tested on pw_boot_armv7m and
pw_sys_io_baremetal_stm32f429 packages.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/33580

third_party/pigweed Rolled-Commits: 82cf6876302b54b..ce9109836366098
Roller-URL: https://ci.chromium.org/b/8853217054649702976
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8853217054649702976
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5e41b2407fc70e26d536148f9451c504515b8628
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/36500
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 82cf687..ce91098 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 82cf6876302b54bdb802a756337889a1731ce3df
+Subproject commit ce9109836366098da37d6c93e299576208b30511