[roll third_party/pigweed] pw_sync: rename SpinLock -> InterruptSpinLock

Renames the existing pw::sync::SpinLock to InterruptSpinLock to
make it obvious that this is not just a spin lock and that interrupt
masking is included.

This change leaves C++ & GN redirects in place in order to support
migrating Pigweed and customers in follow up changes.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/37560

third_party/pigweed Rolled-Commits: 4b62b896ad220fd..126e01176c7c59a
Roller-URL: https://ci.chromium.org/b/8852932833616278832
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8852932833616278832
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I947f8b11d0f8c3bbf63cf523a7413b5e84c625eb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/37502
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 4b62b89..126e011 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4b62b896ad220fd316c95029c18bc79b54c95ec3
+Subproject commit 126e01176c7c59aa2adba02b122f7057e766ad9a